WO2023207493A1 - Communication method and apparatus - Google Patents

Abstract

Provided in the present application are a communication method and apparatus, which can improve the reliability of data transmission. The method comprises: a first terminal device sending first indication information to a second terminal device, wherein the first indication information is used for indicating at least one physical sidelink feedback channel (PSFCH) time-domain resource within a channel occupancy time (COT); the first terminal device sending a first transport block to the second terminal device within the COT; and in a first PSFCH time-domain resource of the at least one PSFCH time-domain resource, the first terminal device receiving first HARQ information, which is from the second terminal device and corresponds to the first transport block, wherein the first HARQ information occupies at least one interlace.

Description

Communication methods and devices

This application claims priority to the Chinese patent application submitted to the Intellectual Property Office of the People's Republic of China on April 29, 2022, with application number 202210468984.0 and the invention title "Method and Device for Communication", the entire content of which is incorporated into this application by reference. middle.

Technical field

The present application relates to the field of communications, and more specifically, to a communication method and device.

Background technique

Hybrid automatic repeat request (HARQ) technology is a technology that combines forward error correction (FEC) and automatic repeat request (ARQ). Among them, FEC technology adds redundant error correction codes to the transmission code sequence. Under certain conditions, transmission errors can be automatically corrected through decoding and the bit error rate (BER) of the received signal can be reduced. ARQ recovers the erroneous data message by requesting the sender to retransmit the erroneous data message. It is one of the methods used in communication to deal with errors caused by the channel. The sending end sends data to the receiving end. If the receiving end fails to successfully decode the data, it will feedback a negative acknowledgment (NACK) message to the sending end, and/or if the receiving end successfully decodes the data, it will feedback a positive acknowledgment (ACK) message. to the sending end.

Currently, in the sidelink HARQ feedback on the licensed spectrum, the terminal equipment determines the HARQ information corresponding to the data based on the sub-channels and time slots occupied by the physical sidelink shared channel (PSSCH) that transmits the data. Physical sidelink feedback channel (PSFCH) resource. However, the problem of how to perform sideline HARQ feedback of terminal equipment on unlicensed spectrum needs to be solved urgently.

Contents of the invention

This application provides a communication method and device, which can improve the reliability of data transmission.

The first aspect provides a communication method, which can be executed by a chip or chip system on the terminal device side. The method includes: a first terminal device sending first indication information to a second terminal device, the first indication information being used to indicate at least one physical sidelink feedback channel PSFCH time domain resource within the channel occupancy time COT; the third A terminal device sends a first transmission block to the second terminal device in the COT; the first terminal device receives the first PSFCH time domain resource from the at least one PSFCH time domain resource from the second terminal device. The first hybrid automatic repeat request HARQ information corresponding to the first transmission block of the terminal device, the first HARQ information occupies at least one interlace, and the interleave includes at least one resource block.

Based on the above technical solution, the first terminal device sends the first indication information for indicating at least one PSFCH time domain resource in the COT to the second terminal device, which can inform the second terminal device which time domain resources are used to transmit HARQ information, Avoiding COT interruption caused by not transmitting HARQ information on some candidate PSFCH time domain resources/periodic preconfigured PSFCH time domain resources, thereby improving the reliability of data transmission.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: the first terminal device receiving a second transmission block from the second terminal device within the COT; A terminal device in the at least The second PSFCH time domain resource in one PSFCH time domain resource sends the second HARQ information corresponding to the second transport block to the second terminal device, and the second HARQ information occupies at least one interlace.

With reference to the first aspect, in some implementations of the first aspect, the first indication information is used to indicate that the first PSFCH time domain resource is used by the first terminal device to receive the first HARQ information, the The second PSFCH time domain resource is used by the first terminal device to send the second HARQ information. It can avoid conflicts in sending and receiving HARQ information and improve the reliability of data transmission.

With reference to the first aspect, in some implementations of the first aspect, the at least one PSFCH time domain resource belongs to the candidate PSFCH time domain resource within the COT. Optionally, the first indication information is used to indicate at least one PSFCH time domain resource among the candidate PSFCH time domain resources within the COT of the first terminal equipment. Optionally, the first indication information is used to indicate whether each candidate PSFCH time domain resource in the COT of the first terminal device is a time domain resource in at least one PSFCH time domain resource.

With reference to the first aspect, in some implementations of the first aspect, the number of symbols occupied by one PSFCH time domain resource in the at least one PSFCH time domain resource is equal to or greater than 1. That is to say, the number of symbols occupied by part of the PSFCH time domain resources in at least one PSFCH time domain resource may be greater than 1, and the number of symbols occupied by part of the PSFCH time domain resources may be equal to 1; or, all PSFCHs in at least one PSFCH time domain resource may occupy The number of symbols occupied by time domain resources may be greater than 1; or, the number of symbols occupied by all PSFCH time domain resources in at least one PSFCH time domain resource may be equal to 1.

With reference to the first aspect, in some implementations of the first aspect, the first sideline control information SCI schedules the first transmission block, the first SCI indicates that the first transmission block is multicast, and the The number of symbols occupied by the first PSFCH time domain resource is greater than 1.

With reference to the first aspect, in some implementations of the first aspect, a third PSFCH time domain resource in the at least one PSFCH time domain resource occupies a first symbol and a second symbol, and the first symbol and the third Two symbols are used to send HARQ information, or the first symbol and the second symbol are used to receive HARQ information, wherein the third PSFCH time domain resource includes the first PSFCH time domain resource or the third PSFCH time domain resource. 2. PSFCH time domain resources.

In order to meet OCB requirements, the transmission of HARQ information is based on the interleaved form of PRB. The number of interlaces included in the PSFCH time domain resource occupying one symbol is limited, and the PSFCH time domain resource may not be sufficient. Therefore, increasing the symbols occupied by PSFCH time domain resources used to transmit HARQ information can improve the reliability of data transmission. That is, one PSFCH slot may include one or more symbols used to transmit HARQ information.

With reference to the first aspect, in some implementations of the first aspect, the frequency domain resources and code domain resources of the first symbol are used first, and the frequency domain resources and code domain resources of the second symbol are used later, Alternatively, the frequency domain resource of the first symbol and the frequency domain resource of the second symbol are used first, and the code domain resource of the first symbol and the code domain resource of the second symbol are used later.

With reference to the first aspect, in some implementations of the first aspect, a third PSFCH time domain resource in the at least one PSFCH time domain resource occupies a first symbol and a second symbol, and the first symbol is used to transmit HARQ information, the second symbol is used to receive HARQ information, or the first symbol is used to receive HARQ information, and the second symbol is used to send HARQ information, wherein the third PSFCH time domain resource includes the first PSFCH time domain resource and/or the second PSFCH time domain resource.

With reference to the first aspect, in some implementations of the first aspect, the time slot in which the third PSFCH time domain resource is located includes symbols for sending a third transport block, and the third PSFCH time domain resource occupies the The first symbol is used to send HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used to receive HARQ information. In The first symbol is used to receive HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used to send HARQ information. This solution can ensure that the number of transceiver conversion points is as small as possible.

With reference to the first aspect, in some implementations of the first aspect, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information, and the The at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information. Each interleave used to transmit transport blocks has a corresponding interleave used to transmit HARQ information, which can further ensure the transmission of HARQ information and improve the reliability of data transmission.

The second aspect provides a communication method, which can be executed by a chip or chip system on the terminal device side. The method includes: the second terminal device receives first indication information from the first terminal device, the first indication information is used to indicate at least one physical sidelink feedback channel PSFCH time domain resource within the channel occupancy time COT; said The second terminal equipment receives the first transmission block from the first terminal equipment in the COT; the second terminal equipment transmits the first PSFCH time domain resource in the at least one PSFCH time domain resource to the The first terminal device sends first hybrid automatic repeat request HARQ information corresponding to the first transmission block, where the first HARQ information occupies at least one interlace, and the interlace includes at least one resource block.

Based on the above technical solution, the second terminal device receives the first indication information sent by the first terminal device to indicate at least one PSFCH time domain resource in the COT, and the second terminal device can learn which time domain resources are used to transmit HARQ information. , to avoid COT interruption caused by not transmitting HARQ information on some candidate PSFCH time domain resources/periodic preconfigured PSFCH time domain resources, thereby improving the reliability of data transmission.

With reference to the second aspect, in some implementations of the second aspect, the method further includes: the second terminal device sending a second transmission block to the first terminal device within the COT; the second terminal The device receives the second HARQ information corresponding to the second transmission block from the first terminal device in the second PSFCH time domain resource of the at least one PSFCH time domain resource, and the second HARQ information occupies at least one staggered.

With reference to the second aspect, in some implementations of the second aspect, the first indication information is used to indicate that the first PSFCH time domain resource is used by the first terminal device to receive the first HARQ information, the The second PSFCH time domain resource is used by the first terminal device to send the second HARQ information. It can avoid conflicts in sending and receiving HARQ information and improve the reliability of data transmission.

Combined with the second aspect, in some implementations of the second aspect, the at least one PSFCH time domain resource belongs to the candidate PSFCH time domain resource within the COT. Optionally, the first indication information is used to indicate at least one PSFCH time domain resource among the candidate PSFCH time domain resources within the COT of the first terminal equipment. Optionally, the first indication information is used to indicate whether each candidate PSFCH time domain resource in the COT of the first terminal device is a time domain resource in at least one PSFCH time domain resource.

With reference to the second aspect, in some implementations of the second aspect, the number of symbols occupied by one PSFCH time domain resource in the at least one PSFCH time domain resource is equal to or greater than 1. That is to say, the number of symbols occupied by part of the PSFCH time domain resources in at least one PSFCH time domain resource may be greater than 1, and the number of symbols occupied by part of the PSFCH time domain resources may be equal to 1; or, all PSFCHs in at least one PSFCH time domain resource may occupy The number of symbols occupied by time domain resources may be greater than 1; or, the number of symbols occupied by all PSFCH time domain resources in at least one PSFCH time domain resource may be equal to 1.

Combined with the second aspect, in some implementations of the second aspect, the first side row control information SCI schedules the first Transport block, the first SCI indicates that the first transport block is multicast, and the number of symbols occupied by the first PSFCH time domain resource is greater than 1.

With reference to the second aspect, in some implementations of the second aspect, a third PSFCH time domain resource in the at least one PSFCH time domain resource occupies a first symbol and a second symbol, and the first symbol and the third The two symbols are used for the first terminal device to send HARQ information, or the first symbol and the second symbol are used for the first terminal device to receive HARQ information, wherein the third PSFCH time domain resource includes The first PSFCH time domain resource or the second PSFCH time domain resource.

In order to meet OCB requirements, the transmission of HARQ information is based on the interleaved form of PRB. The number of interlaces included in the PSFCH time domain resource occupying one symbol is limited, and the PSFCH time domain resource may not be sufficient. Therefore, increasing the symbols occupied by PSFCH time domain resources used to transmit HARQ information can improve the reliability of data transmission. That is, one PSFCH slot may include one or more symbols used to transmit HARQ information.

Combined with the second aspect, in some implementations of the second aspect, the frequency domain resources and code domain resources of the first symbol are used first, and the frequency domain resources and code domain resources of the second symbol are used later, Alternatively, the frequency domain resource of the first symbol and the frequency domain resource of the second symbol are used first, and the code domain resource of the first symbol and the code domain resource of the second symbol are used later.

With reference to the second aspect, in some implementations of the second aspect, a third PSFCH time domain resource in the at least one PSFCH time domain resource occupies a first symbol and a second symbol, and the first symbol is used for the The first terminal device sends HARQ information, and the second symbol is used by the first terminal device to receive HARQ information, or the first symbol is used by the first terminal device to receive HARQ information, and the second symbol is used by the first terminal device to receive HARQ information. The symbol is used by the first terminal device to send HARQ information, wherein the third PSFCH time domain resource includes the first PSFCH time domain resource and/or the second PSFCH time domain resource.

With reference to the second aspect, in some implementations of the second aspect, the time slot in which the third PSFCH time domain resource is located includes symbols for the first terminal device to send a third transport block, and the third PSFCH time domain resource The first symbol occupied by domain resources is used by the first terminal device to send HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used by the first terminal device to receive HARQ information, wherein, The first symbol precedes the second symbol; or, the time slot in which the third PSFCH time domain resource is located includes a symbol for the first terminal equipment to receive the fourth transport block, and the third PSFCH time domain resource The first symbol occupied by the resource is used by the first terminal device to receive HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used by the first terminal device to send HARQ information. This solution can ensure that the number of transceiver conversion points is as small as possible.

With reference to the second aspect, in some implementations of the second aspect, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information, and the The at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information. Each interleave used to transmit transport blocks has a corresponding interleave used to transmit HARQ information, which can further ensure the transmission of HARQ information and improve the reliability of data transmission.

The third aspect provides a communication method, which can be executed by a chip or chip system on the terminal device side. The method includes: the first terminal device sends a first transmission block to the second terminal device within the channel occupancy time COT, the first transmission block occupies at least one interleave, and the interleave includes at least one resource block; the first The terminal device receives the first hybrid automatic repeat request HARQ information corresponding to the first transmission block from the second terminal device in the COT, and the first HARQ information occupies at least one interleaved frequency domain resource. It is determined based on at least one interleaved frequency domain resource occupied by the first transport block.

Based on the above technical solution, at least one interleaved frequency domain resource occupied by the first HARQ information corresponding to the first transport block is determined based on at least one interleaved frequency domain resource occupied by the first transport block, and each interleave used for transmitting TB There are corresponding interleavings for transmitting HARQ information, which can further ensure the transmission of HARQ information and improve the reliability of data transmission.

With reference to the third aspect, in some implementations of the third aspect, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information. Optionally, the interleaved frequency domain resources occupied by the first transport block are the same as the interleaved frequency domain resources occupied by the first HARQ information, or the interleaved frequency domain resources occupied by the first HARQ information are greater than those occupied by the first transport block. Partially interleaved frequency domain resources in an interlace.

Combined with the third aspect, in some implementations of the third aspect, the frequency domain resource corresponding to the j-th interleave of the first time slot is the same as the frequency domain resource corresponding to the i-th interlace of the second time slot, and the A time slot is a time slot for transmitting the first transport block, the second time slot is a time slot for receiving the first HARQ information, and the i-th interleaving of the first time slot is associated with the second time slot. The jth interleave of the slot, where i and j are positive integers.

With reference to the third aspect, in some implementations of the third aspect, the method further includes: the first terminal device sends a second transmission block to the second terminal device within the COT, and the second transmission block The block occupies at least one interleave; the first terminal device receives the second HARQ information corresponding to the second transmission block from the second terminal device in the COT, and the second HARQ information occupies at least one interleave. The interleaved frequency domain resource is determined based on at least one interleaved frequency domain resource occupied by the second transport block.

With reference to the third aspect, in some implementations of the third aspect, the at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information.

In conjunction with the third aspect, in some implementations of the third aspect, the frequency domain resource corresponding to the j-th interleave of the third time slot is the same as the frequency domain resource corresponding to the i-th interleave of the second time slot, and the The third time slot is a time slot for transmitting the second transport block, the first time slot is a time slot for receiving the second HARQ information, and the i-th interleaving of the third time slot is associated with the second time slot. The jth interleave of the gap.

In connection with the third aspect, in some implementations of the third aspect, the code domain resource of the PSFCH resource corresponding to the i-th interlace in the first time slot corresponds to the i-th interlace in the third time slot. The code domain resources of the PSFCH resources are different. For example, the code domain resources used when sending the first HARQ information are different from the code domain resources used when the second HARQ information is sent.

In conjunction with the third aspect, in some implementations of the third aspect, the first time slot and the third time slot are associated with the second time slot, and the second time slot is the first time slot. The terminal equipment sends the first time slot including PSFCH resources after M time slots after the first transmission block in the first time slot, and the second time slot is the first time slot in which the first terminal equipment transmits the first transmission block in the first time slot. The first time slot including PSFCH resources after M time slots after the second transport block is transmitted in the third time slot.

When multiple transmission TB time slots correspond to one HARQ information transmission time slot, code division multiplexing of HARQ information corresponding to multiple transmission TB time slots can avoid insufficient allocation of PSFCH resources and further improve the reliability of data transmission.

In conjunction with the third aspect, in some implementations of the third aspect, at least one fourth time slot is associated with a second time slot, and the second time slot is a time slot used by the first terminal device to receive HARQ information, and at least one The fourth time slot is a time slot used by the first terminal device to send TB, the second time slot is a first time slot of M time slots after the fourth time slot used to receive HARQ information, and at least one fourth time slot is used to receive HARQ information. The slot includes a first time slot and a third time slot. Alternatively, at least one fifth time slot is associated with a sixth time slot, the sixth time slot is a time slot used by the first terminal device to send HARQ information, and at least one fifth time slot is used by the first terminal device to receive TB time slots, at least one fifth time slot is in the COT of the first terminal device Shared time slot, the sixth time slot is the first time slot M time slots after the fifth time slot used to send HARQ information.

The fourth aspect provides a communication method, which can be executed by a chip or chip system on the terminal device side. The method includes: the second terminal device receives a first transmission block from the first terminal device within the channel occupancy time COT, the first transmission block occupies at least one interleave, and the interleave includes at least one resource block; The second terminal device sends the first hybrid automatic repeat request HARQ information corresponding to the first transmission block to the first terminal device in the COT, and the first HARQ information occupies at least one interleaved frequency domain resource. It is determined based on at least one interleaved frequency domain resource occupied by the first transport block.

Based on the above technical solution, at least one interleaved frequency domain resource occupied by the first HARQ information corresponding to the first transport block is determined based on at least one interleaved frequency domain resource occupied by the first transport block, and each interleave used for transmitting TB There are corresponding interleavings for transmitting HARQ information, which can further ensure the transmission of HARQ information and improve the reliability of data transmission.

With reference to the fourth aspect, in some implementations of the fourth aspect, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information. Optionally, the interleaved frequency domain resources occupied by the first transport block are the same as the interleaved frequency domain resources occupied by the first HARQ information, or the interleaved frequency domain resources occupied by the first HARQ information are greater than those occupied by the first transport block. Partially interleaved frequency domain resources in an interlace.

In connection with the fourth aspect, in some implementations of the fourth aspect, the frequency domain resource corresponding to the j-th interlace of the first time slot is the same as the frequency domain resource corresponding to the i-th interlace of the second time slot, and the A time slot is a time slot for transmitting the first transport block, the second time slot is a time slot for receiving the first HARQ information, and the i-th interleaving of the first time slot is associated with the second time slot. The jth interleave of the gap, where i and j are positive integers.

With reference to the fourth aspect, in some implementations of the fourth aspect, the method further includes: a second terminal device receiving a second transmission block from the first terminal device in the COT, and the second The transport block occupies at least one interlace; the second terminal device sends the second HARQ information corresponding to the second transport block to the first terminal device in the COT, and the second HARQ information occupies at least one interleave. The interleaved frequency domain resource is determined based on at least one interleaved frequency domain resource occupied by the second transport block.

With reference to the fourth aspect, in some implementations of the fourth aspect, the at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information.

In conjunction with the fourth aspect, in some implementations of the fourth aspect, the frequency domain resource corresponding to the j-th interlace of the third time slot is the same as the frequency domain resource corresponding to the i-th interlace of the second time slot, and the The third time slot is a time slot in which the second terminal device receives the second transmission block, the second time slot is a time slot in which the second terminal device sends the second HARQ information, and the third time slot is a time slot in which the second terminal device sends the second HARQ information. The i-th interlace of a slot is associated with the j-th interlace of the second time slot.

In conjunction with the fourth aspect, in some implementations of the fourth aspect, the code domain resource of the PSFCH resource corresponding to the i-th interlace in the first time slot corresponds to the i-th interlace in the third time slot. The code domain resources of the PSFCH resources are different.

In conjunction with the fourth aspect, in some implementations of the fourth aspect, the first time slot and the third time slot are associated with the second time slot, and the second time slot is the second time slot. The terminal equipment receives the first time slot including PSFCH resources after M time slots after the first transmission block in the first time slot, and the second time slot is the second time slot when the second terminal equipment receives the first transmission block in the first time slot. The first time slot including PSFCH resources after M time slots after the third time slot receives the second transport block.

In conjunction with the fourth aspect, in some implementations of the fourth aspect, at least one fourth time slot is associated with a second time slot, and the second time slot is a time slot used by the first terminal device to receive HARQ information, and at least one The fourth time slot is set for the first terminal A time slot reserved for transmitting TB, the second time slot is the first time slot of M time slots after the fourth time slot for the first terminal device to receive HARQ information, and at least one fourth time slot includes the first time slot. slot and the third time slot. Alternatively, at least one fifth time slot is associated with a sixth time slot, the sixth time slot is a time slot used by the first terminal device to send HARQ information, and at least one fifth time slot is used by the first terminal device to receive TB time slots, at least one fifth time slot is a shared time slot in the COT of the first terminal device, and the sixth time slot is the first of M time slots after the fifth time slot for the first terminal device to send HARQ Information time slot.

In a fifth aspect, a communication device is provided, which device can be applied to the first terminal device described in the first aspect. The device includes: a sending unit configured to send first indication information to the second terminal device, said The first indication information is used to indicate at least one physical sidelink feedback channel PSFCH time domain resource within the channel occupancy time COT; the sending unit is also used to send a first transmission block to the second terminal device within the COT ; A receiving unit, configured to receive the first hybrid automatic repeat request HARQ information corresponding to the first transmission block from the second terminal device in the first PSFCH time domain resource in the at least one PSFCH time domain resource. , the first HARQ information occupies at least one interlace, and the interlace includes at least one resource block.

In conjunction with the fifth aspect, in some implementations of the fifth aspect, the receiving unit is further configured to receive a second transmission block from the second terminal device in the COT; the first terminal device is The second PSFCH time domain resource in the at least one PSFCH time domain resource sends the second HARQ information corresponding to the second transport block to the second terminal device, and the second HARQ information occupies at least one interleave; The sending unit is further configured to send the second HARQ information corresponding to the second transport block to the second terminal device in the second PSFCH time domain resource in the at least one PSFCH time domain resource, and the second HARQ information occupies at least one interlace.

With reference to the fifth aspect, in some implementations of the fifth aspect, the first indication information is used to indicate that the first PSFCH time domain resource is used to receive the first HARQ information, the second PSFCH time domain Resources are used to send the second HARQ information.

In conjunction with the fifth aspect, in some implementations of the fifth aspect, the at least one PSFCH time domain resource belongs to the candidate PSFCH time domain resource within the COT.

With reference to the fifth aspect, in some implementations of the fifth aspect, the number of symbols occupied by one PSFCH time domain resource in the at least one PSFCH time domain resource is equal to or greater than 1.

With reference to the fifth aspect, in some implementations of the fifth aspect, the first sideline control information SCI schedules the first transmission block, the first SCI indicates that the first transmission block is multicast, and the The number of symbols occupied by the first PSFCH time domain resource is greater than 1.

With reference to the fifth aspect, in some implementations of the fifth aspect, a third PSFCH time domain resource in the at least one PSFCH time domain resource occupies a first symbol and a second symbol, and the first symbol and the third Two symbols are used to send HARQ information, or the first symbol and the second symbol are used to receive HARQ information, wherein the third PSFCH time domain resource includes the first PSFCH time domain resource or the third PSFCH time domain resource. 2. PSFCH time domain resources.

With reference to the fifth aspect, in some implementations of the fifth aspect, the frequency domain resources and code domain resources of the first symbol are used first, and the frequency domain resources and code domain resources of the second symbol are used later, Alternatively, the frequency domain resource of the first symbol and the frequency domain resource of the second symbol are used first, and the code domain resource of the first symbol and the code domain resource of the second symbol are used later.

With reference to the fifth aspect, in some implementations of the fifth aspect, a third PSFCH time domain resource in the at least one PSFCH time domain resource occupies a first symbol and a second symbol, and the first symbol is used to transmit HARQ information, the second symbol is used to receive HARQ information, or the first symbol is used to receive HARQ information, the second symbol Two symbols are used to transmit HARQ information, wherein the third PSFCH time domain resource includes the first PSFCH time domain resource and/or the second PSFCH time domain resource.

With reference to the fifth aspect, in some implementations of the fifth aspect, the time slot in which the third PSFCH time domain resource is located includes symbols for sending a third transport block, and the third PSFCH time domain resource occupies the The first symbol is used to send HARQ information, and the second symbol occupied by the third PSFCH time domain resource is used to receive HARQ information, wherein the first symbol precedes the second symbol; or, the third symbol The time slot in which the three PSFCH time domain resources are located includes symbols for receiving the fourth transport block. The first symbol occupied by the third PSFCH time domain resource is used for receiving HARQ information. The second symbol is used to send HARQ information.

With reference to the fifth aspect, in some implementations of the fifth aspect, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information, and the The at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information.

A sixth aspect provides a communication device, which can be applied to the first terminal device described in the second aspect. The device includes: a sending unit configured to send a message to the second terminal device within the channel occupancy time COT. A first transmission block, the first transmission block occupies at least one interlace, and the interlace includes at least one resource block; a receiving unit configured to receive the first transmission from the second terminal device within the COT The first hybrid automatic repeat request HARQ information corresponding to the block, and the at least one interleaved frequency domain resource occupied by the first HARQ information is determined based on the at least one interleaved frequency domain resource occupied by the first transmission block.

With reference to the sixth aspect, in some implementations of the sixth aspect, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information.

In conjunction with the sixth aspect, in some implementations of the sixth aspect, the frequency domain resource corresponding to the j-th interleave of the first time slot is the same as the frequency domain resource corresponding to the i-th interlace of the second time slot, so The first time slot is a time slot for transmitting the first transport block, the second time slot is a time slot for receiving the first HARQ, and the i-th interleaving of the first time slot is associated with the second The jth interleave of the time slot, where i and j are positive integers.

With reference to the sixth aspect, in some implementations of the sixth aspect, the sending unit is further configured to send a second transmission block to the second terminal device in the COT, and the second transmission block occupies At least one interleaving; the receiving unit is further configured to, within the COT, receive the second HARQ information corresponding to the second transmission block from the second terminal device, and the second HARQ information occupies at least one The interleaved frequency domain resource is determined based on at least one interleaved frequency domain resource occupied by the second transport block.

With reference to the sixth aspect, in some implementations of the sixth aspect, the at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information.

In connection with the sixth aspect, in some implementations of the sixth aspect, the frequency domain resource corresponding to the j-th interleave of the third time slot is the same as the frequency domain resource corresponding to the i-th interleave of the second time slot, and the The third time slot is a time slot for transmitting the second transport block, the first time slot is a time slot for receiving the second HARQ information, and the i-th interleaving of the third time slot is associated with the second time slot. The jth interleave of the gap.

With reference to the sixth aspect, in some implementations of the sixth aspect, the code domain resource of the PSFCH resource corresponding to the i-th interlace in the first time slot corresponds to the i-th interlace in the third time slot. The code domain resources of the PSFCH resources are different.

In conjunction with the sixth aspect, in some implementations of the sixth aspect, the first time slot and the third time slot are associated with the second time slot, and the second time slot is the first time slot. The terminal device sends the first transmission block in the first time slot The first time slot including PSFCH resources after the last M time slots, and the second time slot is M time slots after the first terminal device sends the second transmission block in the third time slot. The first slot after the slot that contains PSFCH resources.

In a seventh aspect, a communication device is provided, including a processor and a transceiver. The transceiver is configured to receive computer codes or instructions and transmit them to the processor. The processor executes the computer codes or instructions, as described in the seventh aspect. The method of any one embodiment of the first aspect to the fourth aspect or the first aspect to the fourth aspect.

In an eighth aspect, a computer-readable storage medium is provided. The computer-readable medium stores a computer program; when the computer program or processor is run on a computer, the computer or processor executes the first step. The method of any one embodiment of the aspect to the fourth aspect or the first aspect to the fourth aspect.

A ninth aspect provides a computer program product that, when run on a computer, causes the computer to execute the method of any one of the first to fourth aspects or the first to fourth aspects.

The solutions provided in the above fifth to ninth aspects are used to implement or cooperate with the methods provided in the above first to fourth aspects, and therefore can achieve the same or corresponding beneficial effects as those in the first to fourth aspects, here No further details will be given.

Description of the drawings

Figure 1 is a schematic diagram of the channel structure of the next time slot under the standard cyclic prefix (NCP).

Figure 2 is a schematic diagram of the channel structure of the next time slot under extended cyclic prefix (ECP).

Figure 3 is a schematic diagram of periodically configured PSFCH resources.

Figure 4 is a schematic diagram of the first part of Type1 LBT.

Figure 5 is a schematic diagram of Type2 LBT.

Figure 6 is a schematic diagram of four PSSCH time slots associated with one PSFCH time slot.

Figure 7 is a schematic diagram of the correlation between PSSCH time slots for data transmission and PSFCH time slots for feedback HARQ information.

Figure 8 is a schematic diagram of the V2X system.

Figure 9 is a schematic diagram of communication between UEs through sidelinks.

Figure 10 is a schematic flow interaction diagram of a communication method proposed by an embodiment of the present application.

Figure 11 shows the candidate PSFCH time domain resources included in the COT when the configuration period of the PSFCH time domain resource is 2.

Figure 12 shows candidate PSFCH time domain resources included in different COTs when the configuration period of PSFCH time domain resources is 2.

Figure 13 is an interlaced schematic diagram.

Figure 14 is a schematic diagram of determining the PSSCH time slot associated with the PSFCH time slot.

Figure 15 is a schematic structural diagram of a PSFCH time slot with symbol 1 occupied by PSFCH time domain resources.

Figure 16 is a schematic structural diagram of a PSFCH time slot with symbol 2 occupied by four PSFCH time domain resources.

Figure 17 is a schematic structural diagram of a PSFCH time slot including two PSFCH symbols.

Figure 18 is a schematic flow interaction diagram of another communication method proposed by an embodiment of the present application.

Figure 19 is a schematic diagram of the interleaving of different time slots.

Figure 20 is a schematic diagram of interleaving of PSFCH slots including 2 PSFCH symbols.

Figure 21 is a schematic block diagram of a communication device according to an embodiment of the present application.

Figure 22 is a schematic block diagram of another communication device according to an embodiment of the present application.

Figure 23 is a schematic block diagram of a communication device according to an embodiment of the present application.

Detailed ways

The technical solutions in this application will be described below with reference to the accompanying drawings.

Embodiments of the present application can be applied to various communication systems, such as sidelink communication systems, vehicle to everything (V2X) systems, wireless local area network (WLAN) systems, and narrowband Internet of Things systems. (narrow band-internet of things, NB-IoT), global system for mobile communications (GSM), enhanced data rate for gsm evolution (EDGE), wideband code division multiple access System (wideband code division multiple access, WCDMA), code division multiple access 2000 system (code division multiple access, CDMA2000), time division synchronous code division multiple access system (time division-synchronization code division multiple access, TD-SCDMA), long-term evolution System (long term evolution, LTE), satellite communications, fifth generation (5th generation, 5G) system, sixth generation (6th generation, 6G) system, communication on licensed spectrum, communication on unlicensed spectrum or those that will appear in the future New communication systems etc.

The terminal device involved in the embodiments of this application may be a device or chip or module that includes a wireless transceiver function and can provide communication services to users. Specifically, the terminal device can be a device in a vehicle to everything (V2X) system, a device in a device to device (D2D) system, or a machine type communication (MTC) system. equipment, equipment in sidelink communications, etc. May include various handheld devices with wireless communication capabilities, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to wireless modems. The terminal can be a mobile station (MS), a subscriber unit (subscriber unit), a user equipment (UE), a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, Wireless local loop (WLL) station, smart phone (smart phone), wireless data card, personal digital assistant (PDA) computer, tablet computer, wireless modem (modem), handheld device (handset) ), laptop computers, machine type communication (MTC) terminals, terminal equipment in 5G networks or networks after 5G or future evolved public land mobile networks (PLMN) The terminal equipment in the application includes chips or devices or modules with extended reality (XR), virtual reality (VR) functions, etc. This application does not limit this.

The network equipment involved in the embodiments of this application mainly refers to base stations, also known as wireless access points, transceiver stations, relay stations, cells, transceiver points, evolved base stations, new generation base stations, road site units, RSU), etc., the embodiments of this application do not limit this.

In the V2X communication system, it includes transmission between terminals and terminals, transmission between vehicles and terminals, and transmission between network equipment/base stations and terminals/vehicles. The vehicle-mounted terminal needs to stay connected to the network to obtain some configuration information, and also needs to stay connected to other vehicle-mounted terminals to achieve vehicle-mounted communication. The connection between the vehicle-mounted terminal equipment and the base station is an uplink and a downlink, and the connection between the vehicle-mounted terminal equipment is a sidelink (SL). Sidelink communications on unlicensed spectrum include transmission between network equipment and network equipment, transmission between terminals and terminals, and transmission between network equipment/base stations and terminals.

Some terms involved in the embodiments of this application are explained below.

(1) Physical sidelink control channel (PSCCH)

The PSCCH carries the first-level sidelink control information (SCI). In the time domain, PSCCH occupies two or three orthogonal frequency division multiplexing (OFDM) symbols starting from the second side row symbol in a time slot. Whether it is two symbols or three symbols is determined by Base station configuration or preconfiguration. In the frequency domain, the physical resource block (PRB) carrying the PSCCH changes from the associated object Starting from the lowest PRB of the lowest sub-channel of the physical sidelink shared channel (PSSCH), and the number of PRBs occupied by the PSCCH does not exceed the number of PRBs included in one sub-channel in the resource pool. PSCCH consists of {10,12,15,20,25} PRBs, and the specific value is indicated by sl-FreqResourcePSCCH-r16. The number of PRBs included in the subchannel includes {10,12,15,20,25,50,75,100}, and the specific value is indicated by sl-SubchannelSize-r16.

As shown in Figure 1, a schematic diagram of the channel structure of the next time slot under the normal cyclic prefix (NCP) is shown. Among them, the next time slot in NCP includes 14 symbols. This time slot includes PSFCH resources.

As shown in Figure 2, a schematic diagram of the channel structure of the next time slot under extended cyclic prefix (ECP) is shown. Among them, the next slot in ECP includes 12 symbols. This time slot includes PSFCH resources.

(2) Physical sidelink shared channel (PSSCH)

The PSSCH carries the second level SCI and data. In the time domain, when a time slot does not include PSFCH resources, 12 symbols are used to carry PSSCH; when a time slot includes PSFCH resources, 9 symbols are used to carry PSSCH. In the frequency domain, PSSCH occupies continuous L _subCh sub-channels. In addition, within a time slot, the first OFDM symbol copies the information sent on the second symbol for automatic gain control (automatic gain control, AGC).

(3) Physical sidelink feedback channel (PSFCH)

Feedback information is carried in PSFCH. Within a time slot of a resource including a PSFCH, the penultimate OFDM symbol and the third OFDM symbol carry the PSFCH. The signal transmitted on the penultimate symbol is a repetition of the signal transmitted on the penultimate symbol so that the receiving UE can perform AGC adjustment. PSFCH resources are periodically configured in the resource pool, such as N=0,1,2,4. Among them, N=0 means that the resource pool does not include PSFCH resources, and the HARQ function is disabled at this time; N=2 means that one time slot out of every two time slots in the resource pool includes PSFCH resources. As shown in Figure 3, a schematic diagram of periodically configured PSFCH resources is provided.

(4) Guard period (GAP) symbol

The UE may receive PSSCH and transmit PSFCH respectively in two consecutive time slots, or the UE may receive PSSCH and transmit PSFCH respectively in the same time slot, or the UE may receive PSFCH and transmit PSFCH respectively in the same time slot. Therefore, after the PSSCH and after the PSFCH symbol, an additional GAP symbol needs to be added for the UE's transceiver conversion. In addition, as long as the terminal device may have a receive-to-send conversion or a send-to-receive conversion in the time domain, the GAP of the transceiver conversion is required.

In addition, in the sidelink in unlicensed band (SL-U) of the unlicensed spectrum, transmission in sub-channel units can be supported in the frequency domain, and transmission in an interlace manner can also be supported. That is, the basic unit of frequency domain resource allocation is a sub-channel or interleave. In this embodiment of the present application, the frequency domain unit of sidelink resources is a sub-channel or an interleave.

(5)SCI format

In NR side-link communication, SCI includes first-level SCI and second-level SCI, where the first-level SCI is carried on the PSCCH channel and the second-level SCI is carried on the PSSCH channel.

In new radio vehicle to everything (NR-V), the first level SCI includes a format, SCI format 1-A.

The fields included in SCI format 1-A are: priority value, frequency domain resource allocation, time domain resource allocation, resource reservation period, demodulation reference signal (DMRS) mode, second-level SCI format, Beta offset value (beta-offset) indication, DMRS port number indication, modulation and coding scheme (MCS), MCS table indication, PSFCH overhead indication, reserved bits.

The second level SCI in NR-V includes two formats, SCI format 2-A and SCI format 2-B.

The fields included in SCI format 2-A are: hybrid automatic repeat request (HARQ) process number, new data indicator (NDI), redundancy version (redundancy version, RV), source identifier (source ID), destination ID, HARQ feedback enable/disable indication, cast type indicator (cast type indicator), channel state information (channel state information, CSI) request.

The fields included in SCI format 2-A are: number of HARQ processes, NDI, RV, source ID, destination ID, HARQ feedback enable/disable indication, zone identification (zone Identity, zone ID), communication distance requirement (communication range requirement).

(6) Occupied channel bandwidth (OCB)

According to regulatory requirements, when occupying channels on unlicensed spectrum, the following requirements must be met. Simply put, when occupying channels in unlicensed spectrum, the occupied channel bandwidth needs to reach 80% or more of the entire channel bandwidth. The channel bandwidth is generally 20MHz as the baseline. Temporary occupancy below 80% of the channel bandwidth is allowed, but the minimum is 2MHz. The occupation does not need to be continuous. For example, non-continuous frequency domain resources are occupied, but the span between the first frequency domain resource and the last frequency domain resource occupied meets the requirements of 80% or more of the channel bandwidth, which is also considered to meet the OCB Require.

(7) Transceiver conversion time

In sidelink communication, the transceiver transition time refers to the time required for a terminal device to switch from the receiving state to the transmitting state, that is, the time required for the transceiver transition or the time required for the terminal device to switch from the transmitting state to the receiving state, that is, the transmitting state. The time required for conversion. The principle is the same as GAP.

In order to facilitate the understanding of the embodiments of the present application, a brief introduction is given to the hybrid automatic repeat request (HARQ) technology and the listen-before-talk (LBT) technology.

(1)HARQ technology

HARQ is a technology that combines forward error correction (FEC) and automatic repeat request (ARQ). Among them, FEC technology adds redundant error correction codes to the transmission code sequence. Under certain conditions, transmission errors can be automatically corrected through decoding and the bit error rate (BER) of the received signal can be reduced. ARQ recovers the erroneous data message by requesting the sender to retransmit the erroneous data message. It is one of the methods used in communication to deal with errors caused by the channel. The sending end sends data to the receiving end. If the receiving end successfully decodes the data, it will feedback a positive acknowledgment (ACK) message to the sending end. If the receiving end fails to successfully decode the data, it will feedback a negative acknowledgment (NACK) message to the sending end.

In NR-V, both unicast and multicast support HARQ feedback. The HARQ feedback method during unicast is: if the receiving end successfully decodes the data, it will feed back an ACK message to the sending end; if the receiving end does not successfully decode the data, it will feed back a NACK message to the sending end. There are two HARQ feedback methods in multicast. One is the same as the feedback method in unicast. If the receiving end successfully decodes the data, it will feed back an ACK message to the sending end. If the receiving end does not successfully decode the data, it will feed back a NACK message to the sending end. ; Another feedback method is that if the receiving end successfully decodes the data, no feedback information will be sent to the sending end. If the receiving end does not successfully decode the data, a NACK message will be fed back to the sending end, that is, a negative response (NACK only) feedback method.

(2)LBT technology

For wireless communication technology in unlicensed frequency bands, because the availability of channels in unlicensed frequency bands cannot be guaranteed at all times, LBT is a channel access mechanism that enables unlimited local area networks to effectively share the same spectrum resources. LBT requires monitoring the channel before transmitting data, performing clear channel assessment (CCA), and ensuring that the channel is idle before transmitting data.

The channel access process of wireless communication in unlicensed spectrum (new radio in unlicensed band, NR-U) is mainly The process in which a standardized base station or UE obtains channel access opportunities in unlicensed frequency bands and performs data transmission. Specifically, there are two channel access modes, including Frame Based Equipment (FBE) and Load based Equipment (LBE). Which access mode is used for wireless resources? Control (radio resource control, RRC) signaling is configured in the resource pool. LBE is a very important channel evaluation and access mechanism in NR-U, and is the key to whether NR-U can achieve fair coexistence with other systems. The FBE mechanism is mainly suitable for ensuring environments where wireless fidelity (Wi-Fi) does not exist and there is only a single NR-U network in the geographical area using the frequency band, such as an independently deployed factory environment.

According to the different levels of access channels from difficult to easy, the LBT levels are divided into 4 categories:

Type 1 (Type 1): Random backoff LBT with non-fixed length contention window, also called Type 1 channel access process. After detecting that the channel is occupied or the maximum transmission time is reached, the sender enters the contention window. The length of the contention window can be changed. Type1LBT consists of two parts. Channel detection with length T _d is T _d =T _f +m _P *T _S1 . When all detection times within T _d are idle, the second part of loop detection is entered. The cycle detection is based on the cycle process of counter N. The initial value of N is a random number between 0 and CW _p . As shown in Figure 4, a schematic diagram of the first part of Type1LBT is shown.

Type 2 (Type 2): Also called Type 2 channel access process.

Type 2A (Type 2A): Within the transceiver conversion time (gap) of 25us, there are two 9us detection windows, and the length of the basic unit of detection is 9us. For a certain channel, if the detection results of both detection windows are idle, it can be understood that the detection power of at least 4us is lower than the energy detection threshold, then the channel is determined to be idle, and data can be sent on the channel. Among them, in SL communication, the transmission and reception conversion time refers to the preparation time required for transmission and reception conversion or for transmission and reception conversion.

Type 2B (Type 2B): Within the 16us gap, the detection time is at least 5us, and the detection channel is idle for at least 4us.

Type 2C (Type 2C): There is no need to perform LBT to directly access the channel when the gap is less than 16us. At this time, the device accessing the channel can only use 584us for transmission. Among them, Type 2C does not have LBT, and some regions and countries do not mandate the implementation of the LBT mechanism in unlicensed frequency bands. As shown in Figure 5, a Type2 LBT schematic is provided.

The channel occupancy time (COT) initialized by the base station can be shared with the UE. Similarly, the COT initialized by the UE can be shared with the base station.

In order to facilitate understanding of the embodiments of the present application, the prior art related to the embodiments of the present application is briefly introduced below.

A time slot including PSFCH resources is associated with one or more time slots used for transmitting data. The time slot including PSFCH resources may be recorded as a PSFCH time slot, and the time slot used for transmitting data may be recorded as a PSSCH time slot. The meaning of association is that the HARQ information corresponding to the data transmitted in the one or more PSSCH time slots is fed back in the PSFCH time slot. PSFCH resources are included in the PSFCH time slot, so the UE can use the PSFCH resources to send or receive HARQ. As shown in Figure 6, a schematic diagram of four PSSCH time slots associated with one PSFCH time slot is shown.

The minimum value of the feedback timing from the PSSCH time slot to the PSFCH time slot is K, and K is 2 or 3. If the UE receives PSSCH in time slot n, the UE feeds back HARQ information in time slot n+K and the first time slot including PSFCH resources among time slots n+K and time slots after time slot n+K. Therefore, after the feedback timing from PSSCH time slot to PSFCH time slot is determined, the PSSCH time slot associated with the PSFCH time slot is also determined.

Currently, the terminal equipment determines the PRB resources used to transmit HARQ information based on the subchannels and time slots occupied by the PSSCH. Specifically, Assumption (1): PSFCH resources are configured periodically, with a period of 2, which can be understood as one time slot in every two time slots includes PSFCH resources; Assumption (2): K=2, the UE is in the time slot n receives PSSCH, at HARQ information is sent in time slot n+2 and the first time slot including PSFCH resources among the time slots after time slot n+2.

As shown in Figure 7, a schematic diagram of the relationship between the PSSCH time slot for transmitting data and the PSFCH time slot for feeding back HARQ information is shown. The transport block (TB) transmitted in time slot n and time slot n+1 feeds back the corresponding HARQ in time slot n+3. Each time slot including PSFCH resources corresponds to 2 time slots for transmitting TBs. The sub-channels included in the two time slots used for transmitting TB are each allocated at least one PRB resource used for transmitting HARQ. In Figure 7, time slot n includes 2 sub-channels, and time slot n+1 includes 2 sub-channels. There are 4 sub-channels in total. There are 12 PRBs configured to transmit HARQ, so each sub-channel in each time slot Corresponds to 3 PRBs.

In R16NR-V, PSFCH only occupies one PRB and does not meet the OCB requirements on unlicensed spectrum. In order to meet the requirements of OCB, the transmission form of PSFCH will change, which may lead to insufficient PSFCH resources. The mapping rules of the subchannel used to send data in each time slot in Rel-16 to the PSFCH resources used to transmit HARQ information are not Be applicable.

In order to facilitate understanding of the embodiments of the present application, the system architecture and application scenarios applicable to the embodiments of the present application are introduced below.

The embodiments of this application are applicable to wireless communication technology on licensed spectrum and wireless communication technology on unlicensed spectrum. Communication systems applicable to this application include communication systems related to terminals, such as communication between terminal equipment and terminal equipment, communication between vehicles and terminal equipment, and communication between network equipment/base stations and terminal equipment/vehicles. .

Taking the V2X scenario as an example, the vehicle terminal needs to stay connected to the network to obtain some configuration information, and also needs to stay connected to other vehicle terminals to achieve vehicle communication. As shown in Figure 8, a schematic diagram of the V2X system is shown. For XR, VR, and MR scenarios, the embodiments of this application are also applicable. The embodiments of this application are applicable to sidelink communication. The sidelink can also be understood as a side link or a direct link, but is not limited to a specific scenario. As shown in Figure 9, a schematic diagram of communication between UEs through sidelinks is shown.

The embodiment of this application proposes a communication method that can improve the reliability of data transmission. As shown in FIG. 10 , a schematic flow interaction diagram of a communication method 1000 proposed by an embodiment of the present application is shown. It should be understood that the transport block in the embodiment of the present application can be understood as data, and the data can also be understood as transport block. The field in the embodiment of this application can be understood as a field or S bits, where S is an integer greater than or equal to 1.

1010. The first terminal device sends first indication information to the second terminal device. The first indication information is used to indicate at least one PSFCH time domain resource in the COT. Correspondingly, the second terminal device receives the first indication information from the first terminal device.

The first indication information may be used to indicate at least one time slot within the COT that includes PSFCH time domain resources, that is, the PSFCH time slot. Optionally, the first indication information is used to indicate symbols including PSFCH time domain resources in the COT, and one PSFCH time domain resource occupies at least one symbol. That is to say, each PSFCH time domain resource in at least one PSFCH time domain resource corresponds to one time slot, or each PSFCH time domain resource in at least one PSFCH time domain resource corresponds to at least one symbol. Optionally, time domain resources can be understood as time units. For example, time domain resources can be time slots, symbols, frames, subframes, absolute time, or other time units, which are not limited in this application.

Optionally, the PSFCH time domain resource may be a time domain resource used for transmitting PSFCH in a time slot including PSFCH resources.

For example, the PSFCH time domain resource may be a PSFCH time slot, and the PSFCH time slot may be a time slot including PSFCH resources or a time slot including PSFCH time domain resources.

For example, since the starting position of COT is dynamic and the ending position of COT is also dynamic, therefore, COT may include a time slot or some symbols in a time slot. When the COT includes part of the symbols in the time slot, part of the symbols in the time slot can also be understood as a PSFCH time domain resource, that is, part of the symbols in the time slot may include PSFCH resources.

Optionally, the first indication information may be carried on the first-level SCI, may be carried on the second-level SCI, or may be carried on the medium access control layer (medium access control, MAC) control element (CE), or Carried in SCI, or carried in MAC sub-header (header).

Optionally, the first indication information is used to indicate at least one PSFCH time domain resource in the COT. It can be understood that the first indication information is only used for at least one PSFCH time domain resource in the COT, or the first indication information is used for Indicates information including at least one PSFCH time domain resource within the COT. In other words, the first indication information is COT indication information, or the COT indication information includes the first indication information, or the first indication information is a field in the COT indication information.

Exemplarily, the first terminal device sends first indication information to the second terminal device. The first indication information may be COT indication information, which is used to indicate at least one of the following: starting position of COT, length of COT, COT Resource occupancy within the PSFCH resource, at least one time slot including PSFCH resources. The resource occupancy situation in the COT may include resources used by the first terminal device in the COT and resources shared with other terminal devices.

Exemplarily, the first indication information is used to indicate at least one of the following: time-frequency resources used by the first terminal equipment in the COT, identification information of the shared terminal equipment, time-frequency resources used by the shared terminal equipment, at least one of which includes PSFCH resources. time slot. Wherein, the frequency domain resource in the time-frequency resource used by the first terminal device or the shared terminal device may be indicated by at least one of the following: the starting position and length of the frequency domain resource unit, the frequency domain resource unit may be interleaved, sub- Channel or PRB or RE (Resource Element), where the starting position can be the lowest frequency domain resource unit in the frequency domain or the highest frequency domain resource unit in the frequency domain; such as the index and number of the starting interleaving in the frequency domain ; Either full frequency band/bandwidth/partial bandwidth/resource pool/all frequency domain resources of one or more channels or all frequency domain resources for LBT. The time domain resources in the time-frequency resources used by the first terminal device or the shared terminal device may be indicated by one or more sets of time domain starting positions and time domain lengths. The time domain length can be a symbol, a time slot, a frame, a subframe, an absolute time or other time units, and is not limited here. The identification information of the shared terminal device includes identification information of the target terminal device (destination ID) and/or identification information of the source terminal device (source ID). In one implementation, the first terminal device performs Type 1 LBT, and can initialize a COT after the LBT is successful. The length of the COT is related to at least one of the priority value included in the SCI and the channel access priority class (CAPC). The value range of CAPC is 1, 2, 3, and 4. The smaller the value, the higher the priority. The priority value included in the SCI is the value of the priority field included in the SCI, and the value can be 1, 2, 3, 4, 5, 6, 7, or 8.

For example, the COT length is related to CAPC, and the COT length determined according to CAPC is shown in Table 1.

Table 1

For example, the COT length is related to the priority value in the SCI. The COT length determined according to the priority value in the SCI is shown in Table 2.

Table 2

Exemplarily, the first indication information is used to indicate at least one PSFCH time domain resource among the candidate PSFCH time domain resources within the COT of the first terminal equipment.

At least one PSFCH time domain resource indicated by the first indication information belongs to the candidate PSFCH time domain resource within the COT. in other words,

The first indication information indicates the method of at least one PSFCH time domain resource in the COT, which may be,

The first indication information indicates whether the candidate PSFCH time domain resources in the COT include PSFCH resources.

For example, the first indication information may be used to indicate whether each candidate PSFCH time domain resource in the COT of the first terminal device is a certain PSFCH time domain resource among the at least one PSFCH time domain resource.

For example, the first indication information may be used to indicate whether the candidate PSFCH time domain resource in the COT of the first terminal device is a PSFCH time domain resource.

Optionally, the first terminal device determines at least one PSFCH time domain resource based on at least one of the starting position of the COT, the length of the COT, and the PSFCH configuration period. Here, the PSFCH configuration period can also be understood as a candidate PSFCH resource configuration period, or a PSFCH resource configuration period, or a PSFCH resource configuration period. The PSFCH configuration period may be configured, preconfigured, or predefined. The PSFCH configuration period can be 0, 1, 2, 4, or any positive integer. There are no restrictions here.

Here, the first terminal device can determine the time domain resources that may include PSFCH resources in the COT based on the starting position of the COT, the length of the COT, and the PSFCH configuration period. Combined with the indication information indicating the time domain resources that may include the PSFCH resources, the first terminal device Time domain resources including PSFCH resources are determined.

In an implementation manner, PSFCH resources are periodically configured or pre-configured in a time-frequency resource set. In other words, PSFCH resources are periodically configured at the system level. That is to say, in the time-frequency resource set, the positions of time domain resources that may include PSFCH resources determined by different terminal devices are the same. Here, the time-frequency resource set is a resource pool, spectrum, one or more channels, bandwidth, partial bandwidth, resource block set, etc., which are not limited here. Time domain resources that may include PSFCH resources may be called candidate PSFCH time domain resources (or candidate PSFCH resources). Candidate PSFCH time domain resources do not necessarily include PSFCH resources, but only potentially include PSFCH resources or have the possibility of including PSFCH resources. Whether the candidate PSFCH time domain resources actually include PSFCH resources needs to be configured or indicated, that is, the PSFCH resources depend on the configuration or indication. Candidate PSFCH time domain resources that are indicated to include PSFCH resources may be used to transmit HARQ information, and candidate PSFCH time domain resources that are not indicated to include PSFCH resources cannot be used to transmit HARQ information. The PSFCH configuration period can be 0, 1, 2, 4, or any positive integer. There are no restrictions here.

It should be understood that the candidate PSFCH time domain resources are periodically configured in a time-frequency resource set. The time-frequency resource set can be spectrum, resource pool, channel, bandwidth, partial bandwidth or others, which is not limited here. Each terminal device within the time-frequency resource set is eligible to use the candidate PSFCH time domain resources. Which terminal device specifically uses a certain candidate PSFCH time domain resource depends on which terminal device the channel is occupied or shared.

As shown in Figure 11, candidate PSFCH time domain resources included in the COT when the PSFCH time domain configuration period is 2 are shown. The length of the COT is 5 time slots, and the time slots of the candidate PSFCH time domain resources included in the COT are time slot n, time slot n+2 and time slot n+4. Candidate PSFCH time slots can be understood as time slots that may include PSFCH time domain resources determined according to the PSFCH configuration period. That is, the COT includes 3 candidate PSFCH time slots. The first indication information may occupy 3 bits, and the 3-bit status value indicates whether the candidate PSFCH time domain resources included in time slot n, time slot n+2 and time slot n+4 respectively include PSFCH time domain resources. Specifically, 1 bit includes two status values. The first status value indicates that the corresponding candidate PSFCH time domain resource includes a PSFCH time domain resource (that is, the candidate PSFCH time domain resource is a PSFCH time domain resource); the second status value indicates that the corresponding candidate PSFCH time domain resource The time domain resources do not include PSFCH time domain resources (that is, the candidate PSFCH time domain resources are not PSFCH time domain resources). For example, "0" indicates that the candidate PSFCH time domain resource is not a PSFCH time domain resource, and "1" indicates that the candidate PSFCH time domain resource is a PSFCH time domain resource. Then the 3 bits are "010" indicating that time slot n+2 includes PSFCH time domain resources, time slot n and time slot n+4 do not include PSFCH time domain resources.

For example, the first terminal device may determine whether the candidate PSFCH time slot is a PSFCH time slot based on whether the data in the COT enables HARQ feedback and whether the HARQ information corresponding to the data in other COTs is transmitted in the COT.

Sidelink communication includes three communication service types: unicast, multicast and broadcast. Broadcast service does not support HARQ feedback, while unicast service and multicast service support HARQ feedback. For unicast and multicast, 1 bit (HARQ enable/disable field) is used in the SCI (can be the second-level SCI) to indicate whether HARQ is disabled, that is, whether the TB scheduled by the SCI needs to feedback HARQ information. When the SCI indicates that its scheduled TB does not need to feed back HARQ information, the UE receiving the TB does not need to feed back HARQ information. Therefore, in unlicensed spectrum, configured or preconfigured candidate PSFCH resources may not be used, and COT may be interrupted. Therefore, by using the first indication information to indicate which candidate PSFCH time domain resources among all candidate PSFCH time domain resources in the COT are PSFCH time domain resources, interruption of the COT can be avoided, thereby improving the reliability of data transmission. It should be understood that candidate PSFCH time domain resources that are not PSFCH time domain resources may be used to transmit data/transport blocks. That is to say, if the first terminal device determines that the candidate PSFCH time domain resource is not a PSFCH time domain resource, then the candidate PSFCH time domain resource is used to transmit data. For example, when the candidate PSFCH time slot does not include PSFCH resources, the symbols included in one time slot are used to transmit data, and the data is rate matched on the symbols included in the time slot.

Combined with what is shown in Figure 11 above, due to the limitation of the feedback timing from the PSSCH time slot to the PSFCH time slot, the feedback timing from the PSSCH time slot to the PSFCH time slot is greater than 0, and the data transmission in the candidate PSFCH time slot n in the COT cannot be transmitted in this COT. Time slot feedback, therefore, if time slot n includes PSFCH resources, the PSFCH resources can only be used to transmit HARQ information corresponding to data in other COTs. The other COTs are one or more COTs different from the COT initialized by the first terminal device. COT. If the first terminal device has no other HARQ information within the COT to send, it may indicate that time slot n does not include PSFCH resources. This indication method improves the flexibility of PSFCH resource configuration. And because HARQ for data transmission in the sidelink can be disabled, when the PSFCH resource in a candidate PSFCH time slot is not used, that is to say, the PSSCH time slot corresponding to the candidate PSFCH time slot (used for transmitting data When HARQ is disabled for data transmission in the time slot), it may cause the COT to be accessed by other devices, thereby causing the COT to be interrupted. This PSFCH resource indication method can avoid COT interruption caused by PSFCH symbols not being used, further improving the flexibility of PSFCH resource configuration.

For example, the first terminal device performs Type 1 LBT, and accesses the channel after the LBT is successful. Since LBT success is a probabilistic event, the moment when LBT succeeds is uncertain. Differences in the starting position of the COT, the length of the COT, and the PSFCH configuration period will lead to differences in the candidate PSFCH time domain resources included in the COT. As shown in Figure 12, candidate PSFCH time domain resources included in different COTs are shown when the PSFCH configuration period is 2. in, COT1 includes 5 time slots, and the candidate PSFCH time domain resources include time slot n, time slot n+2, and time slot n+4; COT2 includes 4 time slots, and the candidate PSFCH time domain resources include The time slots are time slot n+2 and time slot n+4; COT3 includes 5 time slots, and the time slots of the candidate PSFCH time domain resources are time slot n+2, time slot n+4 and time slot n +6.

In another implementation manner, the PSFCH time domain resources are configured or indicated by the first terminal equipment. Within the COT of the first terminal equipment, the time slot including the PSFCH time domain resource may be periodic or aperiodic. Specifically, it is configured or instructed by the first terminal device. If the PSFCH time slots in the COT are configured periodically, the configuration period is N. N can be 0, 1, 2, or 4, or any other positive integer. This application does not specifically limit this. At this time, the configuration of the PSFCH time slot depends on the COT. The starting position and length of COT are different, and the time slots including PSFCH resources may be different.

In this implementation, the first indication information may indicate at least one PSFCH time domain resource in the COT by indicating a time domain resource (time slot) including the PSFCH resource in the COT.

For example, the first indication information may be used to indicate at least one time slot including PSFCH resources in the COT or to indicate at least one PSFCH time slot in the COT.

For example, the first indication information may be used to indicate whether each time slot in the COT includes a PSFCH time domain resource or to indicate whether each time slot in the COT is a PSFCH time slot. For example, the COT length is N, and N bits are used to indicate whether each time slot includes PSFCH time domain resources or does not include PSFCH time domain resources. The length of the COT is N, which can be understood as the number of time slots included in the COT is N. If the COT includes part of the symbols of a time slot, it is recorded as one time slot. Each bit has two status values, one status value is used to indicate that the time slot includes PSFCH time domain resources, and the other status value is used to indicate that the time slot does not include PSFCH time domain resources. The two status values can be "0" and "1" respectively. It should be understood that after the PSFCH time domain resources in the COT are determined, one or more PSSCH time slots associated with the PSFCH time slot can be determined based on the feedback timing from the PSSCH time slot to the PSFCH time slot. Optionally, at least one PSFCH time domain resource may be a PSFCH time domain resource used by the first terminal device to send HARQ information, or a PSFCH time domain resource used by the first terminal device to receive HARQ information.

Optionally, at least one PSFCH time domain resource may be a PSFCH time domain resource used by the first terminal device to send HARQ information of data in the current COT, or a PSFCH used by the first terminal device to send HARQ information of data in other COTs. The time domain resources are either PSFCH time domain resources used by the first terminal device to receive HARQ information of data in the current COT, or PSFCH time domain resources used by the first terminal device to receive HARQ information of data in other COTs. Other COTs are COTs that are different from the current COT. Other COTs may be initialized by the first terminal device, or may not be initialized by the first terminal device.

1020. The first terminal device sends the first transmission block to the second terminal device within the COT. The first transport block can be understood as first data. The first transport block may be carried in the PSSCH. When two TBs are carried in one PSSCH, the first transport block may be one of the two TBs. Correspondingly, the second terminal device receives the first transmission block from the first terminal device within the COT.

1030. The second terminal device sends the first HARQ information corresponding to the first transport block to the first terminal device in the first PSFCH time domain resource of at least one PSFCH time domain resource. The first terminal device receives the first HARQ information corresponding to the first transport block from the second terminal device in the first PSFCH time domain resource of at least one PSFCH time domain resource, and the first HARQ information occupies at least one interlace. , the interleave includes at least one resource block. It should be understood that the time slot including the first PSFCH time domain resource is associated with the PSSCH time slot for sending the first transport block, and the time slot including the first PSFCH time domain resource is M time slots after the first transport block is sent. The first includes PSFCH funding The time slot of the source.

In order to meet OCB requirements, the transmission of HARQ information can support the form of PRB-based interleaving. An interleave includes at least one resource block. For example, the number of resource blocks included in the interleaving may be preconfigured or configured or predefined. Interleaving can be understood as RB interleaving, sub-channel, RB set, discrete RB set, and interleaving. The number of resource blocks included in an interlace can be related to the subcarrier spacing.

For example, assume that a time slot including PSFCH resources includes M interlaces. Interleaving m∈{0,1,…,M-1} among M interleavings consists of common resource blocks {m,M+m,2M+m,3M+m,…}, where M is a numbering table 1 gives the number of interleaves. Bandwidth Part/Channel/Resource Pool/Spectrum/Part Bandwidth/Interleaved resource blocks in resource block set i and interlace m with common resource block The relationship between them is expressed by the following formula (1):

in, is the common resource block where the bandwidth part/channel/resource pool/spectrum/partial bandwidth/set of resource blocks starts with respect to common resource block 0. When there is no risk of confusion, the index subcarrier spacing μ can be deleted. A common resource block can be understood as a resource block included in a time slot.

The terminal equipment expects that the number of common resource blocks in the interlace contained in the bandwidth part/channel/resource pool/spectrum/partial bandwidth/resource block set i is not less than 10. The number of PRBs in the interleaving corresponding to different subcarrier spacing is shown in Table 3.

Table 3 Number of PRBs in interleaving

As shown in Figure 13, a staggered schematic diagram is provided. 20M bandwidth, 30kHz, frequency domain includes 51 PRBs. Assume that the frequency domain interval between two adjacent PRBs in an interlace is 5 PRBs. As shown in Figure 13, the PRB indexes included in interlace #0 are 0, 5, 10, 15, 20, 25, 30, 35. 40, 45, 50; one interlace contains 10 or 11 PRBs; 51 PRBs include a total of 5 interlaces. Optionally, PSFCH can be sent in an interleaved form or in a resource block form. It may be configured or indicated that the PSFCH is sent in an interleaved form or in a resource block form. For example, network device configuration or pre-configuration PSFCH is sent in an interleaved form or in a resource block form. Or the SCI indicates that the PSFCH is sent in an interleaved form or in a resource block form. This application does not specifically limit this.

Optionally, the second terminal equipment sends the second transmission block to the first terminal equipment in the COT; the first terminal equipment receives the second transmission block from the second terminal equipment in the COT; the first terminal equipment transmits the second transmission block to the first terminal equipment in at least one PSFCH. The second PSFCH time domain resource in the time domain resource sends the second HARQ information corresponding to the second transport block to the second terminal device. The second HARQ information occupies at least one interlace, and the interlace includes at least one resource block; correspondingly, The second terminal device receives the second HARQ information corresponding to the second transmission block from the first terminal device. It should be understood that the time slot including the second PSFCH time domain resource is associated with the PSSCH time slot for receiving the second transport block, and the time slot including the second PSFCH time domain resource is M time slots after receiving the second transport block. The first one includes the slot of PSFCH resources.

PSFCH time domain resources include two types, corresponding to two uses, one is for the first terminal device to send HARQ information, and the other is used by the first terminal device to receive HARQ information.

Optionally, the first indication information is used to indicate whether the PSFCH time domain resource in the at least one PSFCH time domain resource is used by the first terminal device to send HARQ information or to receive HARQ information. For example, the first indication information includes 1 bit, and the 1 bit is used to indicate whether the PSFCH time domain resource is used for the first terminal device to send HARQ information or to receive HARQ information.

Optionally, the first indication information is not only used to indicate at least one PSFCH time domain resource, but also used to indicate whether the PSFCH time domain resource in the at least one PSFCH time domain resource is used for the first terminal device to send HARQ information or to receive. HARQ information. For example, the first indication indicates L PSFCH time domain resources in the COT, where L1 of the L PSFCH time domain resources are used by the first terminal device to send HARQ information, and L2 are used by the first terminal device to receive HARQ information. Among them, L1+L2=L.

Optionally, the first indication information is used to indicate that the PSFCH time domain resource in the at least one PSFCH time domain resource is used by the first terminal equipment or other terminal equipment to send HARQ information or to receive HARQ information. That is to say, other terminal devices can also send data within the COT initialized by the first terminal device and receive corresponding HARQ information. This application does not limit this.

Optionally, the first indication information is used to indicate at least one PSFCH time domain resource within the COT. The PSFCH time domain resource includes the time domain resource used by the first terminal device to send HARQ information and/or the time domain resource used by the first terminal device. Time domain resources for receiving HARQ information. For example, a time slot may include time domain resources used by the first terminal device to send HARQ information, or a time slot may include time domain resources used by the first terminal device to receive HARQ information, or a time slot may include the first terminal device. The time domain resources used by the device to send HARQ information and the time domain resources used to receive HARQ information.

Optionally, the PSFCH time domain resources include time domain resources used by the first terminal device to send HARQ information corresponding to the data currently transmitted within the COT. That is to say, the PSFCH time domain resources include the time domain resources used by the first terminal device to send the HARQ information in the COT, and the HARQ information in the COT is the HARQ information corresponding to the data transmitted in the COT; or, the PSFCH time domain resources include the third A terminal device is used to send time domain resources of HARQ information corresponding to data transmitted within other COTs. That is to say, the PSFCH time domain resources include the time domain resources used by the first terminal device to send HARQ information in other COTs. The HARQ information in other COTs is the HARQ information corresponding to the data transmitted in other COTs; the HARQ information in other COTs is also It can be understood as HARQ information fed back across COTs; among them, other COTs and the current COT are different COTs.

Exemplarily, the first indication information is used to indicate that the first PSFCH time domain resource is used by the first terminal device to receive the first HARQ information, and the second PSFCH time domain resource is used by the first terminal device to send the second HARQ information.

Optionally, the first terminal device determines the PSSCH time slot associated with the PSFCH time domain resource according to whether the PSFCH time domain resource is used by the first terminal device to receive HARQ information or to send HARQ information.

Optionally, the first terminal device determines the PSSCH time slot associated with the PSFCH time domain resource according to at least one of the following:

PSFCH time domain resources are used to send HARQ information;

PSFCH time domain resources are used to receive HARQ information;

PSFCH time domain resources are used to send HARQ information corresponding to the data transmitted within the current COT;

PSFCH time domain resources are used to send HARQ information corresponding to data transmitted in other COTs;

The PSFCH time domain resource is used to receive HARQ information corresponding to the data transmitted within the current COT;

PSFCH time domain resources are used to receive HARQ information corresponding to data transmitted in other COTs;

The PSSCH time slot is used by the first terminal device to send data;

The PSSCH time slot is used for other terminal devices to send data. The other terminal devices are terminal devices that share the resources within the COT initialized by the first terminal device;

Feedback timing from PSSCH slot to PSFCH slot.

For example, when determining the PSSCH time domain resources associated with the PSFCH time slot, it is necessary to determine whether the PSFCH time slot is used by the terminal device to receive HARQ information or to send HARQ information. As shown in Figure 14, a schematic diagram of determining the PSSCH time domain resources associated with the PSFCH time slot is shown. For example, UE1 initializes the COT, which includes 6 time slots. Among them, PSSCH time slot 1, PSSCH time slot 4, PSSCH time slot 5 and PSSCH time slot 6 are used by UE1. PSSCH time slot 2 and PSSCH time slot 3 are used respectively. Share to UE2 and UE3. The PSFCH time domain resources included in PSFCH slot 1 and PSFCH slot 3 are used by UE1 to send HARQ information, and the PSFCH time domain resources included in PSFCH slot 2 are used by UE1 to receive HARQ information. UE1 may be the first terminal device in the embodiment of the present application, and UE2 or UE3 may be the second terminal device in the embodiment of the present application.

If the feedback timing K from PSSCH time slot to PSFCH time slot is equal to 2, for PSSCH time slot 2 (PSFCH time slot 1), there is no associated PSSCH time slot, and the data transmitted in the current COT cannot be fed back in PSFCH time slot 1. The PSFCH time domain resources included in PSFCH slot 1 can be used by UE1 to send past HARQ information. Among them, past HARQ information can be understood as HARQ information corresponding to data transmitted in other COTs. It can also be understood as HARQ information to be fed back, including HARQ information that has not been successfully sent in other COTs due to LBT failure or other reasons, or HARQ information that cannot be sent in other COTs because it does not meet the feedback timing from PSSCH timeslot to PSFCH timeslot.

PSSCH time slot 4 (PSFCH time slot 2) is used for UE1 to receive HARQ information, so the PSSCH time slot associated with PSFCH time slot 2 is the time slot for UE1 to send TB. Otherwise, assuming that the time slot in which UE1 receives data is associated with PSFCH time slot 2, UE1 may need to send and receive HARQ information in PSFCH time slot 2. At this time, there is a potential transmission and reception conflict. According to the feedback timing from PSSCH time slot to PSFCH time slot, if K is equal to 2, the PSSCH time slot associated with PSFCH time slot 2 is PSSCH time slot 1.

PSSCH time slot 6 (PSFCH time slot 3) is used for UE1 to send HARQ information, so the PSSCH time slot associated with PSFCH time slot 3 is the time slot for UE1 to receive TB. According to the feedback timing from PSSCH time slot to PSFCH time slot, if K is equal to 2, then the PSSCH time slots associated with PSFCH time slot 3 are PSSCH time slot 2 and PSSCH time slot 3. The TB sent by UE1 on PSSCH slot 4, PSSCH slot 5 and PSSCH slot 6 cannot be obtained in the current COT because there is no PSFCH slot in the COT that satisfies the feedback timing from PSSCH slot to PSFCH slot. Corresponding HARQ information, the HARQ information of the TB sent on PSSCH time slot 4, PSSCH time slot 5 and PSSCH time slot 6 can only be received in PSFCH time slots in other COTs.

UE1 sends TB in time slot 1 and receives the corresponding HARQ information in time slot 4; UE1 receives data from UE2 and UE3 in time slot 2 and time slot 3 respectively, and sends corresponding HARQ information to UE2 and UE3 in time slot 6 respectively. . Assuming that there is past HARQ information that has not been sent, it can be sent in time slot 2.

In R16NR-V, no distinction is made between whether the PSFCH time domain resource is used to send HARQ information or to receive HARQ information. Therefore, a conflict in sending and receiving HARQ information will occur. When a conflict in sending and receiving HARQ information occurs, according to the priority of HARQ information, Determine whether the PSFCH time domain resource is used to send HARQ information or receive HARQ information. In this solution, it is distinguished whether the PSFCH time domain resource is used to send HARQ information or to receive HARQ information, and when determining the PSSCH time slot associated with the PSFCH time domain resource, the purpose of the PSFCH time domain resource is considered, so HARQ information can be avoided to avoid sending and receiving conflicts and improve the reliability of data transmission.

The number of symbols occupied by one PSFCH time domain resource in at least one PSFCH time domain resource indicated by the first indication information equal to or greater than 1. That is to say, the number of symbols occupied by the PSFCH time domain resource in at least one PSFCH time domain resource is not fixed. That is to say, the number of symbols occupied by part of the PSFCH time domain resources in at least one PSFCH time domain resource may be greater than 1, and the number of symbols occupied by part of the PSFCH time domain resources may be equal to 1; or, all PSFCHs in at least one PSFCH time domain resource may occupy The number of symbols occupied by time domain resources may be greater than 1; or, the number of symbols occupied by all PSFCH time domain resources in at least one PSFCH time domain resource may be equal to 1.

Optionally, the first indication information indicates at least one PSFCH time slot in the COT. Some PSFCH time slots include 2 PSFCH symbols, and some PSFCH time slots include 1 PSFCH symbol. The previous symbol of the PSFCH symbol is a copy of the PSFCH symbol, which is used for AGC adjustment. In this application, the copy symbol of the PSFCH symbol used as AGC is not counted as a PSFCH symbol.

In order to meet OCB requirements, the transmission of HARQ information is based on the interleaved form of PRB. The number of interlaces used to transmit HARQ information in the PSFCH time domain resource including one PSFCH symbol is limited, and the PSFCH time domain resource may not be enough. Therefore, the PSFCH time domain resource includes multiple PSFCH symbols, which can ensure the normal operation of HARQ and improve the reliability of data transmission. That is, one PSFCH slot may include one or more symbols used to transmit HARQ information. Here, the PSFCH symbols are symbols used to transmit HARQ information.

As shown in Figure 15, a schematic structural diagram of a PSFCH time slot with symbol 1 occupied by the PSFCH time domain resource is shown. A PSFCH time slot includes 1 symbol used to transmit HARQ information, where the blank symbols in the PSFCH time slot are Symbols occupied by PSCCH and PSSCH. As shown in Figure 16, a schematic structural diagram of a PSFCH time slot occupied by four PSFCH time domain resources with symbol 2 is shown. Among them, one PSFCH time slot includes 2 symbols used to transmit HARQ information. The blank symbols in the PSFCH time slot are symbols occupied by PSCCH and PSSCH. It should be understood that one PSFCH time slot may also include 3 or more symbols for transmitting HARQ information, which is not limited in the embodiment of the present application. For example, a PSFCH time slot includes 3 PSFCH symbols, of which 1 PSFCH symbol among the 3 PSFCH symbols is used to transmit HARQ, and the other 2 PSFCH symbols among the 3 PSFCH symbols are used to transmit HARQ.

Optionally, the previous symbol of each PSFCH symbol is a copy of the PSFCH symbol, which is an AGC symbol. That is, if a time slot includes two PSFCH symbols, the previous symbol of each PSFCH symbol is an AGC symbol. For example, the first, third, and fourth situations in Figure 16.

Optionally, if there are two PSFCH symbols in a PSFCH slot used to transmit HARQ information, the symbol before the first PSFCH symbol is an AGC symbol, and the symbol before the second PSFCH symbol does not have an AGC symbol. At this time, the PSFCH symbol has only one AGC symbol, and the transmit power on the two PSFCH symbols is required to be the same. The PSFCH symbols are symbols used to transmit HARQ information. For example, the second situation in Figure 16.

For example, the number of symbols occupied by the first PSFCH time domain resource in at least one PSFCH time domain resource is greater than 1. Specifically, the first SCI schedules the first transport block, the first SCI indicates that the first transport block is multicast, and the number of symbols occupied by the first PSFCH time domain resource is greater than 1. Since the first transport block is multicast, more PSFCH resources are required to transmit the first HARQ information corresponding to the first transport block. Therefore, the number of symbols occupied by the first PSFCH time domain resource is greater than 1. Among them, the first symbol among the first PSFCH time domain resource occupied symbols is a common resource, and the remaining symbols are resources used to transmit HARQ information corresponding to the multicast data.

Exemplarily, the third PSFCH time domain resource in at least one PSFCH time domain resource occupies a first symbol and a second symbol, and the first symbol and the second symbol are used to transmit HARQ information, or the first symbol and the second symbol are used to transmit HARQ information. In receiving the HARQ information, the third PSFCH time domain resource includes the first PSFCH time domain resource or the second PSFCH time domain resource. That is to say, when the first symbol and the second symbol are used to transmit HARQ information, the third PSFCH time domain resource may include the second PSFCH time domain resource; when the first symbol and the second symbol are used to receive HARQ information, the third PSFCH time domain resource may include ThreePSFCH The time domain resource may include the first PSFCH time domain resource. Here, the first symbol can be extended to a first time domain resource, and the second symbol can be extended to a second time domain resource. That is, a PSFCH time domain resource includes a first time domain resource and a second time domain resource. The first time domain resource can occupy one or more symbols, and the second time domain resource can occupy one or more symbols. The number of symbols occupied by the first time domain resource and the second time domain resource may be different. Optionally, the first time domain resource is used by the first terminal device to send HARQ information, and its associated PSSCH time slot is a time slot used by the first terminal device to receive data. The second time domain resource is used for the first terminal device to receive HARQ information, and its associated PSSCH time slot is a time slot used for the first terminal device to send data. Similarly, the first symbol here is used by the first terminal device to send HARQ information, and its associated PSSCH time slot is a time slot used by the first terminal device to receive data. The second symbol is used by the first terminal device to receive HARQ information, and its associated PSSCH time slot is a time slot used by the first terminal device to send data. This can effectively avoid PSFCH transmission and reception conflicts.

When the first symbol and the second symbol occupied by the third PSFCH time domain resource are both used to receive HARQ information or both are used to send HARQ information, optionally, the resource in the first symbol is a common resource, and the first symbol The HARQ information corresponding to the data transmitted in the PSSCH time slot associated with the symbol can be transmitted in the first symbol, and the resources in the second symbol are resources used for multicast transmission. Or the resources in the first symbol and the second symbol are both public resources, and the HARQ information corresponding to the data transmitted in the PSSCH time slot associated with the time slot in which the first symbol and the second symbol are located can be transmitted in the public resource.

Optionally, the frequency domain resources and code domain resources of the first symbol are used first, and the frequency domain resources and code domain resources of the second symbol are used later; or, the frequency domain resources of the first symbol and the frequency domain resources of the second symbol are used. The resources are used first, the code domain resources of the first symbol and the code domain resources of the second symbol are used later. The frequency domain resources of the first symbol and the frequency domain resources of the second symbol are used first. It can be understood that the frequency domain resources of the first symbol are used first and the frequency domain resources of the second symbol are used later.

The frequency domain resources of the first symbol and the frequency domain resources of the second symbol are used first, and the code domain resources of the first symbol and the code domain resources of the second symbol are used later. It can also be understood that the first symbol and the second symbol The resources are used in the order of: frequency domain resources of the first symbol, frequency domain resources of the second symbol, code domain resources of the first symbol, and code domain resources of the second symbol. For details on how to determine the usable frequency domain resources and/or code domain resources, please refer to the description of S1810 and S1820 in this application. However, it is not limited to the implementation methods given in S1810 and S1820.

As shown in Figure 17, a schematic structural diagram of a PSFCH time slot including two PSFCH symbols is shown. The first terminal device initializes the COT. The COT includes 5 time slots. The first terminal device sends a transmission block in time slot n and receives HARQ information corresponding to the transmission block in time slot n+2. The first transport block is multicast data, and the first terminal device indicates that time slot n+2 includes two PSFCH symbols. The order of use of PSFCH frequency domain resources is: you can use the frequency domain resources included in the first PSFCH symbol first, and then use the frequency domain resources included in the second PSFCH symbol; or, you can use the frequency domain resources included in the first PSFCH symbol first. and code domain resources, and then use the frequency domain resources and code domain resources included in the second PSFCH symbol. Optionally, the resources of the first PSFCH symbol are public resources. The data transmitted in the PSSCH time slot associated with the PSFCH symbol can transmit corresponding HARQ information in the PSFCH symbol. The resources of the second PSFCH symbol can be given to HARQ information used for multicast data. For example, the first terminal device sends a transmission block in time slot n, the transmission block is scheduled by SCI, and the cast type field in the SCI indicates that the transmission type of the transmission block is multicast, then there is more than one receiving terminal device. , the receiving terminal equipment can use part of the resources in the first PSFCH symbol and all the resources in the PSFCH symbol. The receiving terminal device includes the second terminal device in the embodiment of the present application. For the determination method of partial resources in the first PSFCH symbol, refer to the description in S1810 and S1820.

Optionally, under multicast ACK or NACK feedback, if the PSFCH resources are insufficient, the first terminal device can disable the HARQ mechanism and use blind retransmission.

Exemplarily, the third PSFCH time domain resource in at least one PSFCH time domain resource occupies a first symbol and a second symbol, the first symbol is used to send HARQ information, and the second symbol is used to receive HARQ information, or the third symbol One symbol is used to receive HARQ information, and the second symbol is used to send HARQ information, where the third PSFCH time domain resource includes the first PSFCH time domain resource and/or the second PSFCH time domain resource. That is to say, the first PSFCH time domain resource may occupy or include two PSFCH symbols, and/or the second PSFCH time domain resource may occupy or include two PSFCH symbols. Here, the first symbol is earlier than the second symbol in the time domain, and both the first symbol and the second symbol are PSFCH symbols. The PSSCH time slot associated with the first symbol and the PSSCH time slot associated with the second symbol may be different.

Optionally, the time slot in which the first PSFCH time domain resource is located and the time slot in which the second PSFCH time domain resource is located may be the same or different. That is to say, one time slot may include the first PSFCH time domain resource, or the second PSFCH time domain resource, or the first PSFCH time domain resource and the second PSFCH time domain resource.

Optionally, the PSFCH time slot includes PSFCH symbols used for sending HARQ information and PSFCH symbols used for receiving HARQ information. The first terminal device determines the order of the two PSFCH symbols according to whether the PSFCH time slot is shared with other terminal devices.

When a time slot includes time domain resources for transmitting HARQ information and time domain resources for receiving HARQ information, the symbols occupied by the PSFCH time domain resources for transmitting HARQ information and the symbols occupied by the PSFCH time domain resources for receiving HARQ information are The time domain sequence depends on whether the PSSCH resources included in this time slot are used to send transport blocks or to receive transport blocks. When the PSSCH resources included in this time slot are used to send transport blocks, the symbols occupied by the PSFCH time domain resources for sending HARQ information are before the symbols occupied by the PSFCH time domain resources for receiving HARQ information; when the PSSCH resources included in this time slot are When used to receive transport blocks, the symbols occupied by the PSFCH time domain resources for receiving HARQ information are before the symbols occupied by the PSFCH time domain resources for transmitting HARQ information. This ensures that the number of transceiver conversion points is as small as possible.

Exemplarily, the time slot in which the third PSFCH time domain resource is located includes symbols used to send the third transport block, the first symbol occupied by the third PSFCH time domain resource is used to send HARQ information, and the third PSFCH time domain resource occupies The second symbol of is used to receive HARQ information, where the first symbol precedes the second symbol in the time domain. Alternatively, the time slot in which the third PSFCH time domain resource is located includes symbols for receiving the fourth transport block, the first symbol occupied by the third PSFCH time domain resource is used for receiving HARQ information, and the third symbol occupied by the third PSFCH time domain resource is used for receiving HARQ information. Two symbols are used to transmit HARQ information, where the first symbol precedes the second symbol in the time domain. This ensures that the number of transceiver conversion points is as small as possible.

Optionally, the first terminal device may indicate in the first indication information whether the first symbol occupied by the third PSFCH time domain resource is used for transmitting HARQ information or for receiving HARQ information, and whether the second symbol occupied by the third PSFCH time domain resource is used for transmitting HARQ information or for receiving HARQ information. Whether the symbol is used to send HARQ information or to receive HARQ information. Alternatively, the first terminal device may indicate in the first indication information whether the first symbol and the second symbol occupied by the third PSFCH time domain resource are used for transmitting HARQ information or for receiving HARQ information. This can avoid the problem of PSFCH transmission and reception collision caused when there is only one PSFCH symbol in a time slot.

Optionally, at least one interleaved frequency domain resource occupied by the first HARQ information is determined based on at least one interleaved frequency domain resource occupied by the first transport block. In other words, at least one interlace occupied by the first HARQ information is associated with at least one interlace occupied by the first transport block. At least one interleaved frequency domain resource occupied by the second HARQ information is determined based on at least one interleaved frequency domain resource occupied by the second transport block. In other words, at least one interlace occupied by the second HARQ information is associated with at least one interlace occupied by the second transport block.

Exemplarily, at least one interleaved frequency domain resource occupied by the first transport block includes a resource occupied by the first HARQ information. At least one interleaved frequency domain resource, and the at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information. It can be understood that the interleaved frequency domain resources occupied by the first transport block are the same as the interleaved frequency domain resources occupied by the first HARQ information, or the interleaved frequency domain resources occupied by the first HARQ information are much larger than those occupied by the first transport block. The frequency domain resources of some of the interlaces are the same. The frequency domain resources of the interleave occupied by the second transport block are the same as the frequency domain resources of the interleave occupied by the second HARQ information, or the frequency domain resources of the interleave occupied by the second HARQ information are the same as those of multiple interlaces occupied by the second transport block. Partially interleaved frequency domain resources are the same. Optionally, at least one interlace occupied by the first HARQ information belongs to the first interlace set. The first interlace set is a resource that corresponds to at least one interlace occupied by the first transport block and can be used to transmit HARQ information. The frequency domain range of the first interlace set is the same as the frequency domain range of at least one interlace occupied by the first transport block. Optionally, at least one interlace occupied by the second HARQ information belongs to the second interlace set. The second interlace set is a resource that corresponds to at least one interlace occupied by the second transport block and can be used to transmit HARQ information. The frequency domain range of the second interlace set is the same as the frequency domain range of at least one interlace occupied by the second transport block.

Optionally, before the first terminal device receives the first HARQ information corresponding to the first transmission block from the second terminal device, the first terminal device also sends a fifth transmission block to the second terminal device within the COT; first The terminal equipment receives the first HARQ information corresponding to the first transmission block and the fifth HARQ information corresponding to the fifth transmission block from the second terminal equipment in the first PSFCH time domain resource of at least one PSFCH time domain resource, and The code domain resources used by the first HARQ information are different from the code domain resources used by the fifth HARQ information. For specific implementation methods, please refer to S1810 and S1820. This is to prevent the first HARQ information and the fifth HARQ information from using the same frequency domain resources and code domain resources, resulting in the failure of the first HARQ information and the fifth HARQ information to be successfully transmitted, thereby reducing the reliability of corresponding data transmission. In addition, the implementation methods in S1010, S1020, and S1030 can also be combined with S1810 and S1820.

In the technical solution provided by the embodiment of the present application, for the first terminal device to send the first indication information for indicating at least one PSFCH time domain resource in the COT to the second terminal device, the methods include: at the system level On the premise of periodically configuring PSFCH resources, dynamically indicate whether the candidate PSFCH time domain resources in the COT are real PSFCH time domain resources to avoid interruption of the COT due to not transmitting HARQ information on some candidate PSFCH time domain resources. Factors such as HARQ information within the COT, HARQ information fed back across COTs, HARQ disablement, and feedback timing from PSSCH time slots to PSFCH time slots can be fully considered to indicate the PSFCH time domain resources, thereby ensuring the reliability of data transmission and improving Flexibility of PSFCH resource configuration. In addition, the first terminal device may indicate that the PSFCH time domain resource is used to transmit HARQ or receive HARQ, and consider the PSFCH time slot to be used to transmit HARQ or receive HARQ when determining the PSSCH time slot associated with the PSFCH time slot, effectively avoiding potential PSFCH transmission and reception conflicts; the first terminal device can indicate that the PSFCH time slot includes multiple PSFCH symbols, which solves the problem of insufficient PSFCH resources on the unlicensed spectrum, especially for multicast transmission. This ensures the normal operation of the HARQ mechanism and the reliability of data transmission.

Multiple TB transmission time slots correspond to a time slot including PSFCH resources. When PSFCH is transmitted in an interleaved manner, PSFCH resources may not be enough.

To this end, the embodiment of the present application proposes another communication method. Each interleave for transmitting TB has a corresponding interleave for transmitting HARQ information, which further ensures the transmission of HARQ information and improves the reliability of data transmission. As shown in FIG. 18 , a schematic flow interaction diagram of another communication method 1800 proposed by the embodiment of the present application is shown. This embodiment can be combined with the previous embodiment. That is to say, in the previous embodiment, after determining one or more PSFCH time domain resources included in the COT and the purpose of the PSFCH time domain resource, determine the time domain and PSFCH time domain resources. resource The associated PSSCH time slots are then determined to determine the mapping rules from PSSCH time slots to PSFCH time slots, which is the technical solution of this embodiment. The technical solution of this embodiment is not limited to being combined with the previous embodiment.

1810. The first terminal device sends the first transmission block to the second terminal device within the channel occupancy time COT. The first transmission block occupies at least one interlace, and one interlace includes at least one resource block. Correspondingly, the second terminal device receives the first transmission block from the first terminal device within the COT.

The description of the interleaving and COT of this step will not be repeated again. It is the same as the description of the interleaving and COT in the process 1010 in Figure 10 .

1820. The second terminal device sends the first HARQ information corresponding to the first transport block to the first terminal device within the COT. Correspondingly, the first terminal device receives the first HARQ information corresponding to the first transport block from the second terminal device in the COT, and at least one interleaved frequency domain resource occupied by the first HARQ information is occupied according to the first transport block. At least one interleaved frequency domain resource is determined. Specifically, at least one interlace occupied by the first HARQ information is determined from an available interlace set, and the frequency domain resources of the available interlace set are the same as the frequency domain resources of the at least one interlace occupied by the first transport block. At least one interlace occupied by the first HARQ information may be randomly selected from the available interlace set, or may be modulo from the available interlace set according to the source ID in the SCI used to schedule the first transmission block.

Exemplarily, at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information. It can be understood that at least one interlace occupied by the first HARQ information comes from the available interlace set included in the PSFCH time domain resources, and the frequency domain resources of the available interlace set correspond to or are the same as the frequency domain resources of the at least one interlace occupied by the first transport block. It can be understood that the interleaved frequency domain resources occupied by the first transport block are the same as the frequency domain resources of the available interlace set, or the interleaved frequency domain resources occupied by the first HARQ information are the same as those of the multiple interlaces occupied by the first transport block. Partially interleaved frequency domain resources are the same. The interlace occupied by the first HARQ information may be randomly selected from the set of available interlaces. Or taking modulo from the available interleaving set according to the source ID in the SCI used to schedule the first transmission block.

The frequency domain resources corresponding to the i-th interlace of the first time slot are the same as the frequency domain resources corresponding to the j-th interlace of the second time slot. The first time slot is the time slot for transmitting the first transport block, and the second time slot is Receiving the first HARQ time slot (that is, the second time slot includes PSFCH time domain resources), the i-th interlace of the first time slot is associated with the j-th interlace of the second time slot, where i and j are positive integers . Optionally, i can be equal to j. Alternatively, the frequency domain resource corresponding to the i-th interlace of the first time slot is different from the frequency domain resource corresponding to the j-th interlace of the second time slot, and the i-th interleave of the first time slot is associated with the j-th interlace of the second time slot. interleaving, optional, i can be equal to j. Optionally, i may not be equal to j. That is to say, there is a mapping relationship between the frequency domain resources corresponding to the interleaving of the first time slot and the frequency domain resources corresponding to the interleaving of the second time slot. The mapping relationship may be configured, preconfigured, or predefined in the resource pool, or may be indicated in the control information sent by the first terminal device. The control information can be carried on the first-level SCI, the second-level SCI, the MAC CE, or the SCI.

Optionally, the first terminal device sends a second transmission block to the second terminal device in the COT, and the second transmission block occupies at least one interleave; the second terminal device receives the second transmission block from the first terminal device in the COT. , the second terminal device sends the second HARQ information corresponding to the second transmission block to the first terminal device in the COT; the first terminal device receives the second HARQ information corresponding to the second transmission block from the second terminal device in the COT, At least one interleaved frequency domain resource occupied by the second HARQ information is determined based on at least one interleaved frequency domain resource occupied by the second transport block. Specifically, at least one interlace occupied by the second HARQ information is determined from an available interlace set, and the frequency domain resources of the available interlace set are the same as the frequency domain resources of the at least one interlace occupied by the second transport block. At least one interlace occupied by the second HARQ information may be randomly selected from the available interlace set, or may be selected according to the interlace used to schedule the second transmission. The source ID in the block's SCI is modulo the set of available interleaves, either the highest-indexed or highest-end-in-frequency interlace in the set of available interlaces, or the lowest-indexed or lowest start-in-frequency interlace in the set of available interleaves.

Exemplarily, at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information. It can be understood that at least one interlace occupied by the second HARQ information comes from an available interlace set included in the PSFCH time domain resources, and the frequency domain resources of the available interlace set correspond to or are the same as the frequency domain resources of at least one interlace occupied by the second transport block. It can be understood that the frequency domain resources of the available interleave set are the same as the frequency domain resources of the interlace occupied by the second HARQ information, or the frequency domain resources of the available interleave set are part of the interleaved frequencies among the multiple interlaces occupied by the second transport block. domain resources. The interlace occupied by the second HARQ information may be randomly selected from the set of available interlaces. Either it is modulo the set of available interlaces based on the source ID in the SCI used to schedule the second transport block, or the interlace with the highest index or the highest end position in the frequency domain in the set of available interlaces, or the set with the lowest index or The interleave with the lowest starting position in the frequency domain.

The frequency domain resource corresponding to the i-th interlace of the third time slot is the same as the frequency domain resource corresponding to the j-th interlace of the second time slot. The third time slot is the time slot for sending the second transport block. The second time slot is In the time slot for receiving the first HARQ information and the second HARQ information, the i-th interlace of the third time slot is associated with the j-th interlace of the second time slot, where i and j are positive integers. Optionally, i equals j. Alternatively, the frequency domain resource corresponding to the i-th interleave of the third time slot is different from the frequency domain resource corresponding to the j-th interlace of the second time slot, and the i-th interleave of the third time slot is associated with the j-th interleave of the second time slot. interleaving, where j is a positive integer, optionally, i is not equal to j.

That is to say, there is a mapping relationship between the frequency domain resources corresponding to the interleaving of the third time slot and the frequency domain resources corresponding to the interleaving of the second time slot. The mapping relationship may be configured, preconfigured, or predefined in the resource pool, or may be indicated in the control information sent by the first terminal device. The control information can be carried on the first-level SCI, the second-level SCI, the MAC CE, or the SCI.

Optionally, the code domain resource of the PSFCH resource corresponding to the i-th interlace in the first time slot is different from the code domain resource of the PSFCH resource corresponding to the j-th interlace in the third time slot. It can be understood that the code domain resources used when sending the first HARQ information are different from the code domain resources used when sending the second HARQ information. Optionally, the code domain resource sets of the PSFCH resources corresponding to the i-th interlace in the first time slot are the same, and the code domain resource sets of the PSFCH resources corresponding to the j-th interlace in the third time slot are the same. Optionally, the code domain resource of the PSFCH resource corresponding to the i-th interlace in the first time slot is different from the code domain resource of the PSFCH resource corresponding to the j-th interlace in the third time slot. The code domain resource of the PSFCH resource corresponding to the i-th interlace in the first time slot comes from the first code domain resource set, and the code domain resource of the PSFCH resource corresponding to the j-th interlace in the third time slot comes from the second code domain resource. The first code domain resource set and the second code domain resource set are two orthogonal/different code domain resource sets. The first code domain resource set and the second code domain resource set may be configured, preconfigured or predefined.

Optionally, the first time slot and the third time slot are associated with the second time slot, and the second time slot is the M time slot interval after the first terminal device sends the first transmission block in the first time slot. A time slot includes PSFCH resources, and the second time slot is the first time slot including PSFCH resources at an interval of M time slots after the first terminal equipment sends the second transport block in the third time slot.

As shown in Figure 19, a schematic diagram of the interleaving of different time slots is shown. The PSFCH resource corresponding to an interlace used to transmit a TB is an interlace that is the same as the frequency domain resource of the interlace in the time slot including the PSFCH time domain resource. The HARQ information corresponding to the TB in time slot n and time slot n+1 is fed back in time slot n+3. That is, the time slots associated with time slot n+3 are time slot n and time slot n+1. That is, interlace i in slot n corresponds to interleave i in slot n+3, and i can be equal to 0, 1, 2, 3, or 4. Since the frequency domains of different interleaves in time slot n are different, the frequency domains of different interleaves in the PSFCH resource corresponding to time slot n are Also different.

When the time slots for transmitting multiple TBs correspond to one time slot for transmitting HARQ information, the HARQ information corresponding to the time slots for transmitting multiple TBs is code division multiplexed. The HARQ information corresponding to the TB transmitted in time slot n and time slot n+1 is fed back in time slot n+3. The available PSFCH frequency domain resources corresponding to the same interleaving/same frequency domain position in time slot n and time slot n+1 are the same, but the corresponding cyclic shift pair (CS pair) are different. For example, the code domain resources corresponding to the interleave in time slot n come from the first code domain resource set, and the code domain resources corresponding to the interleave in time slot n+1 come from the second code domain resource set.

The specific code domain resources (the first code domain resource set or the second code domain resource set) may be configured, preconfigured or predefined, or may be based on the number of time slots and/or the code domain for transmitting the TB. The quantity of resources is determined. CS pair includes at least one of the following {(0,6); (1,7); (2,8); (3,9); (4,10); (5,11)}, that is, the code domain resources are the most is 12 circular shift offset values. As shown in Table 4, taking 4 CS pairs and 2 transmission TB time slots as an example, a code domain resource allocation method is given. There is orthogonality between different code domain resources, and both frequency division multiplexing and code division multiplexing can ensure orthogonality. For example, the HARQ of TB1 transmitted on interlace 1 in time slot n is fed back on PSFCH interlace 1 in time slot n+3, and the code domain resource used is one of (0,6), (3,9); time slot The HARQ of TB2 transmitted on interlace 1 in slot n+1 is fed back on PSFCH interlace 1 in time slot n+3, and the code domain resource used is one of (1,7) and (4,10).

Table 4

Optionally, at least one fourth time slot is associated with a second time slot, the second time slot is a time slot used by the first terminal device to receive HARQ information, and at least one fourth time slot is used by the first terminal device to send TB time slot, the second time slot is the first time slot used for receiving HARQ information M time slots after the fourth time slot, and at least one fourth time slot includes the first time slot and the third time slot. The set of code domain resources corresponding to each time slot in at least one fourth time slot is different. Alternatively, at least one fifth time slot is associated with a sixth time slot, the sixth time slot is a time slot used by the first terminal device to send HARQ information, and at least one fifth time slot is used by the first terminal device to receive TB time slots, at least one fifth time slot is a time slot shared in the COT of the first terminal device, and the sixth time slot is the first time slot used to send HARQ information after M time slots after the fifth time slot. . The set of code domain resources corresponding to each time slot in at least one fifth time slot is different.

As shown in FIG. 20 , a schematic diagram of interleaving of PSFCH slots including 2 PSFCH symbols is shown. The HARQ information corresponding to the TB in time slot n and time slot n+1 is fed back in time slot n+3, and time slot n+3 includes 2 PSFCH symbols. That is, the time slots associated with time slot n+3 are time slot n and time slot n+1. For example, TB1 transmitted in time slot n occupies interlace 0 and interlace 1. The available resources for the HARQ information corresponding to TB1 include interlace 0 and interlace 1 in the first PSFCH symbol in time slot n+3, and interlace 1 in the second PSFCH symbol. All interlaced. The interleaving order of the HARQ information corresponding to TB1 is: interleaving 0 and interleaving 1 for the first symbol, interleaving 0, interleaving 1, interleaving 2, interleaving 3 and interleaving 4 for the second symbol. It should be understood that when the number of symbols occupied by PSFCH time domain resources in a PSFCH slot is greater than 1, the solution of using different PSFCH symbols to transmit HARQ information can be combined with that described in the embodiment of Figure 10, and will not be described again here.

For example, the PSSCH time slot contains N interleaves, and the PSFCH time slot contains L interleaves. The PSFCH time slot is associated with M PSSCH time slots. Interlace i (1 ≤ i ≤ N) in time slot j (1 ≤ j ≤ M) in the PSSCH time slot can be allocated to one of the L interlaces of the PSFCH time slot. Specifically, it can be one of the L interlaces. The interleaving i. The corresponding code domain resources are Optional, M=L.

The terminal device receives data (transport block) at interleave i (1 ≤ i ≤ N) in slot j (1 ≤ j ≤ M) in the PSSCH slot, the terminal device determines the slot in which the HARQ information for the data is sent, and The frequency domain code domain resources used in this time slot. That is: interlace i among the L interlaces of the PSFCH time slot, the code domain resource is (1≤j≤M) may be preconfigured or configured, or predefined.

Specifically, the code domain resources used may be randomly selected, or may be determined by modulating the code domain resources with the source P _ID contained in the SCI received by the terminal device.

The terminal equipment determines the PSFCH frequency domain resources and code domain resources for transmitting HARQ information, and sends the HARQ information. When the terminal device occupies more than 1 interlace, the corresponding interlace in the PSFCH symbol is also greater than 1. At this time, the frequency domain code domain resource used by the terminal device can be randomly selected, or it can be included in the SCI received by the terminal device. The source P _ID is determined modulo the code domain resource.

Optionally, before sending the HARQ information, perform type 2A/2B/2C LBT. When the LBT is successful, the HARQ information is sent. If the LBT fails, it is not sent.

Optionally, the PSSCH time slot contains interlaces, the PSFCH slot contains A staggered. PSFCH slot association PSSCH slots. at this time interleaves for transmitting data can be allocated interlaces used to transmit HARQ information, then the interlaces in each PSSCH slot can correspond to interleaving in PSFCH slots, slot j in PSSCH slots interleave i in Interleaving in PSFCH slots can be assigned: UE looks forward to yes multiples.

Optional, the frequency domain code domain resources corresponding to the transmission of a PSSCH are: in resources can be used. That is, the resources that can be used to transmit HARQ information are determined based on the starting interlace of the interlace occupied by PSSCH (the interleave with the smallest index among the interlaces occupied by PSSCH, or the interleave with the smallest distance from the starting position in the frequency domain). resources can be used. That is, according to the interleaving occupied by PSSCH To determine the resources that can be used to transmit HARQ information. PSFCH resources are first in The resources are sorted in ascending order of the interleaved index, and then sorted in ascending order of the index according to the circular shift.

Optionally, the PSSCH time slot contains interlaces, the PSFCH slot contains A staggered. PSFCH slot association PSSCH slots. The PSFCH resources corresponding to each PSSCH transmission of the terminal equipment are in is the number of cyclic shift pairs. or In this application, any terminal equipment that needs to send HARQ information can use this method to determine the set of available PSFCH resources.

Optionally, the first terminal device sends the first transmission block to the second terminal device within the COT, and the first transmission block may be multicast data. That is, the transmission type indication field included in the SCI (such as the second-level SCI) that schedules the first transmission block indicates "multicast". The first terminal device receives the first HARQ information corresponding to the first transmission block from the second terminal device in the COT. The first HARQ information may occupy two of the PSFCH time domain resources in the second time slot. Interleaving, the second time slot is the time slot for receiving the first HARQ information. The first interleaving and the second interleaving of the two interleavings are orthogonal, that is, they are two different interleavings in the frequency domain. The first interleave can be used by the terminal device (the terminal device that has received the first transport block, including the second terminal device) to send ACK information, and the second interleave can be used by the terminal device (the terminal device that has received the first transport block). device, including the second terminal device) sends NACK information. That is to say, the two interleaves are common resources, one for all terminal devices that receive the first transport block to send NACK, and one for all terminal devices that receive the first transport block to send ACK. That is, the terminal device that successfully receives the first transport block can send ACK in the first interleave; the terminal device that does not successfully receive the first transport block can send NACK in the second interleave. There may be multiple terminal devices that receive the first transmission block, including the second terminal device. The first interleaving and the second interleaving may be preconfigured, predefined, or configured, or dynamically indicated by the first terminal device, or determined based on the resources occupied by the first transmission block. There are no restrictions here. Optionally, the first terminal device may receive the first HARQ information corresponding to the first transmission block from the second terminal device in other COTs.

Optionally, the first terminal device sends the first transmission block to the second terminal device within the COT, and the first transmission block may be multicast data. That is, the transmission type indication field included in the SCI (such as the second-level SCI) that schedules the first transmission block indicates "multicast". The first terminal equipment receives the first HARQ information corresponding to the first transmission block from the second terminal equipment in the COT. The first HARQ information may occupy one of the PSFCH time domain resources in the second time slot. Interleave, multiple terminal devices that receive the first transport block (multiple terminal devices that receive the first transport block) can jointly use the resource blocks included in one interleave.

Optionally, the number of symbols of the PSFCH time domain resource may be related to the number of bits of HARQ information to be transmitted, or the number of symbols of the PSFCH time domain resource may be indicated by the first terminal device, or the number of symbols of the PSFCH time domain resource may be The number can be associated with the PSFCH format.

Optionally, the first HARQ information occupies an interlace, and the interlace includes X resource blocks. The first HARQ information is carried by PSFCH format 0, so when the second terminal device sends the first HARQ information, it repeatedly sends PSFCH format 0 in X resource blocks, that is, PSFCH format 0 is sent on X resource blocks respectively. The initial cyclic shift value or cyclic shift value of PSFCH format 0 on the X resource blocks may be different. And the initial value of the cyclic shift or the difference between the cyclic shift values of two connected resource blocks among the X resource blocks may be fixed. For example, if 10},{5,11}{0,6},{1,7},{2,8},{3,9}, the difference is 1 at this time.

In the technical solution provided by the embodiment of the present application, at least one interleaved frequency domain resource occupied by the first HARQ information corresponding to the first transport block is determined based on at least one interleaved frequency domain resource occupied by the first transport block. Each The interleaves used to transmit TB have corresponding interleaves used to transmit HARQ information, which can further ensure the transmission of HARQ information and improve the reliability of data transmission. In addition, when multiple transmission TB time slots correspond to one HARQ information transmission time slot, the HARQ information corresponding to multiple transmission TB time slots is code division multiplexed, which can avoid PSFCH. If resources are not allocated enough, the reliability of data transmission can be further improved.

The communication method provided by the embodiment of the present application has been introduced above. The execution subject for executing the above communication method will be introduced below.

This embodiment of the present application provides a communication device. As shown in FIG. 21 , a schematic block diagram of a communication device 2100 according to the embodiment of the present application is provided. The device may be applied or deployed in the first terminal device in the method embodiment of the present application.

The communication device 2100 includes: a sending unit 2110, configured to send first indication information to the second terminal device, where the first indication information is used to indicate at least one physical sidelink feedback channel PSFCH time domain resource within the channel occupancy time COT. ;The sending unit is also configured to send the first transmission block to the second terminal device within the COT;

The receiving unit 2120 is configured to receive the first hybrid automatic repeat request HARQ information corresponding to the first transmission block from the second terminal device in the first PSFCH time domain resource in the at least one PSFCH time domain resource. , the first HARQ information occupies at least one interlace, and the interlace includes at least one resource block.

Optionally, the receiving unit 2120 is further configured to receive a second transmission block from the second terminal device in the COT; the first terminal device in the at least one PSFCH time domain resource. Two PSFCH time domain resources are used to send the second HARQ information corresponding to the second transport block to the second terminal device, and the second HARQ information occupies at least one interleave; the sending unit 2110 is also used to: The second PSFCH time domain resource in the at least one PSFCH time domain resource sends the second HARQ information corresponding to the second transport block to the second terminal device, and the second HARQ information occupies at least one interlace.

Optionally, the first indication information is used to indicate that the first PSFCH time domain resource is used to receive the first HARQ information, and the second PSFCH time domain resource is used to send the second HARQ information.

Optionally, the at least one PSFCH time domain resource belongs to the candidate PSFCH time domain resource in the COT.

Optionally, the number of symbols occupied by one PSFCH time domain resource among the at least one PSFCH time domain resource is equal to or greater than 1.

Optionally, the first sidelink control information SCI schedules the first transport block, the first SCI indicates that the first transport block is multicast, and the number of symbols occupied by the first PSFCH time domain resource is greater than 1 .

Optionally, the third PSFCH time domain resource in the at least one PSFCH time domain resource occupies a first symbol and a second symbol, and the first symbol and the second symbol are used to transmit HARQ information, or, the The first symbol and the second symbol are used to receive HARQ information, wherein the third PSFCH time domain resource includes the first PSFCH time domain resource or the second PSFCH time domain resource.

Optionally, the frequency domain resources and code domain resources of the first symbol are used first, and the frequency domain resources and code domain resources of the second symbol are used later, or the frequency domain resources and code domain resources of the first symbol are used later. The frequency domain resource of the second symbol is used first, and the code domain resource of the first symbol and the code domain resource of the second symbol are used later.

Optionally, the third PSFCH time domain resource in the at least one PSFCH time domain resource occupies a first symbol and a second symbol, the first symbol is used to send HARQ information, and the second symbol is used to receive HARQ information. , or, the first symbol is used to receive HARQ information, and the second symbol is used to send HARQ information, wherein the third PSFCH time domain resource includes the first PSFCH time domain resource and/or the Describe the second PSFCH time domain resource.

Optionally, the time slot in which the third PSFCH time domain resource is located includes symbols used to send a third transport block, and the first symbol occupied by the third PSFCH time domain resource is used to send HARQ information, the third The second symbol occupied by three PSFCH time domain resources is used to receive HARQ information, wherein the first symbol is between the second symbol before; or, the time slot in which the third PSFCH time domain resource is located includes symbols used to receive the fourth transport block, and the first symbol occupied by the third PSFCH time domain resource is used to receive HARQ information, the third The second symbol occupied by three PSFCH time domain resources is used to transmit HARQ information.

Optionally, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information, and the at least one interleaved frequency domain resource occupied by the second transport block The resources include at least one interleaved frequency domain resource occupied by the second HARQ information.

This embodiment of the present application provides a communication device. As shown in FIG. 22 , a schematic block diagram of a communication device 2200 according to the embodiment of the present application is provided. The device may be applied or deployed in the first terminal device in the method embodiment of the present application.

The communication device 2200 includes: a sending unit 2210, configured to send a first transmission block to the second terminal device within the channel occupancy time COT, where the first transmission block occupies at least one interleave, and the interleave includes at least one resource block; The receiving unit 2220 is configured to receive the first hybrid automatic repeat request HARQ information corresponding to the first transmission block from the second terminal device in the COT, and the first HARQ information occupies at least one interleave The frequency domain resources are determined based on at least one interleaved frequency domain resource occupied by the first transmission block.

Optionally, the at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information.

Optionally, the frequency domain resource corresponding to the i-th interleave of the first time slot is the same as the frequency domain resource corresponding to the j-th interleave of the second time slot, and the first time slot is used to send the first transmission. The time slot of the block, the second time slot is the time slot for receiving the first HARQ information, and the i-th interlace of the first time slot is associated with the j-th interlace of the second time slot, where, i and j are positive integers.

Optionally, the sending unit 2210 is also configured to send a second transmission block to the second terminal device within the COT, where the second transmission block occupies at least one interleave; the receiving unit 2220 is also configured to: In the COT, second HARQ information corresponding to the second transmission block from the second terminal device is received, and at least one interleaved frequency domain resource occupied by the second HARQ information is based on the first Determined by at least one interleaved frequency domain resource occupied by the two transport blocks.

Optionally, the at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information.

Optionally, the frequency domain resource corresponding to the i-th interlace of the third time slot is the same as the frequency domain resource corresponding to the j-th interlace of the second time slot, and the third time slot is used to transmit the second transport block. time slot, the first time slot is a time slot for receiving the second HARQ information, and the i-th interlace of the third time slot is associated with the j-th interlace of the second time slot.

Optionally, the code domain resource of the PSFCH resource corresponding to the i-th interlace in the first time slot is different from the code domain resource of the PSFCH resource corresponding to the i-th interlace in the third time slot.

Optionally, the first time slot and the third time slot are associated with the second time slot, and the second time slot is when the first terminal device sends the The first time slot including PSFCH resources after M time slots after the first transport block, the second time slot is after the first terminal equipment sends the second transport block in the third time slot The first slot after the M slots includes PSFCH resources.

This embodiment of the present application provides a communication device 2300. As shown in FIG. 23, a schematic block diagram of the communication device 2300 of the embodiment of the present application is provided.

The communication device 2300 includes: a processor 2310 and a transceiver 2320. The transceiver 2320 is used to receive computer codes or instructions and transmit them to the processor 2310. The processor 2310 executes the computer codes or instructions, To implement the methods in the embodiments of this application. The communication device may be a terminal device or a core network element in the embodiment of this application.

The above-mentioned processor 2310 may be an integrated circuit chip with signal processing capabilities. During the implementation process, each step of the above method embodiment can be completed through an integrated logic circuit of hardware in the processor or instructions in the form of software. The above-mentioned processor can be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (field programmable gate array, FPGA), or other available processors. Programmed logic devices, discrete gate or transistor logic devices, discrete hardware components. Each method, step and logical block diagram disclosed in the embodiment of this application can be implemented or executed. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly implemented by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module can be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other mature storage media in this field. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

An embodiment of the present application also provides a communication system, including a first terminal device and a second terminal device in the communication method provided by the embodiment of the present application.

Embodiments of the present application also provide a computer-readable storage medium on which a computer program for implementing the method in the above method embodiment is stored. When the computer program is run on a computer, the computer can implement the method in the above method embodiment.

Embodiments of the present application also provide a computer program product. The computer program product includes computer program code. When the computer program code is run on a computer, the method in the above method embodiment is executed.

An embodiment of the present application also provides a chip, including a processor, the processor is connected to a memory, the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the The chip executes the method in the above method embodiment.

It should be understood that in the embodiments of the present application, the numbers "first", "second"... are only used to distinguish different objects, such as different devices or different times, and do not limit the scope of the embodiments of the present application. The embodiments of the present application are not limited to this.

In addition, the term "and/or" in this application is only an association relationship describing related objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, and A and B exist simultaneously. , there are three situations of B alone. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship; the term "at least one" in this application can mean "one" and "two or more", for example, A , B and C, it can mean: A exists alone, B exists alone, C exists alone, A and B exist at the same time, A and C exist at the same time, C and B exist at the same time, A, B and C exist at the same time, these seven kinds Condition.

Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functionality for each specific application, but such implementations should not be considered to be beyond the scope of this application.

Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be described again here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be achieved through other means. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit.

If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program code. .

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims (51)

1. A method of communication, characterized by including:

   The first terminal device sends first indication information to the second terminal device, where the first indication information is used to indicate at least one physical sidelink feedback channel PSFCH time domain resource within the channel occupancy time COT;

   The first terminal device sends a first transmission block to the second terminal device within the COT;

   The first terminal equipment receives the first hybrid automatic repeat request HARQ information corresponding to the first transmission block from the second terminal equipment in the first PSFCH time domain resource of the at least one PSFCH time domain resource. , the first HARQ information occupies at least one interlace, and the interlace includes at least one resource block.
2. The method of claim 1, further comprising:

   The first terminal device receives the second transmission block from the second terminal device within the COT;

   The first terminal device sends the second HARQ information corresponding to the second transport block to the second terminal device in the second PSFCH time domain resource of the at least one PSFCH time domain resource, and the second HARQ The message occupies at least one interleave.
3. The method according to claim 2, characterized in that:

   The first indication information is used to indicate that the first PSFCH time domain resource is used by the first terminal device to receive the first HARQ information, and the second PSFCH time domain resource is used by the first terminal device to send the second HARQ information.
4. The method according to any one of claims 1 to 3, characterized in that the at least one PSFCH time domain resource belongs to the candidate PSFCH time domain resource in the COT.
5. The method according to any one of claims 1 to 4, characterized in that,

   The first indication information is used to indicate whether the candidate PSFCH time domain resource in the COT is the at least one PSFCH time domain resource.
6. The method according to claim 5, characterized in that:

   The candidate PSFCH time domain resources in the COT are periodically configured in the time-frequency resource set.
7. The method according to claim 5 or 6, characterized in that, the method further includes:

   The first terminal equipment determines the candidate PSFCH time domain in the COT based on at least one of the starting position of the COT, the length of the COT, and the configuration period of the candidate PSFCH time domain resource in the COT. resource.
8. The method according to any one of claims 1 to 7, characterized in that,

   The number of symbols occupied by one PSFCH time domain resource in the at least one PSFCH time domain resource is equal to or greater than 1.
9. The method according to claim 8, characterized in that first sideline control information SCI schedules the first transport block, the first SCI indicates that the first transport block is multicast, and the first PSFCH The number of symbols occupied by time domain resources is greater than 1.
10. The method according to claim 8, characterized in that:

    The third PSFCH time domain resource in the at least one PSFCH time domain resource occupies a first symbol and a second symbol, and the first symbol and the second symbol are used to transmit HARQ information, or the first symbol and The second symbol is used to receive HARQ information, wherein the third PSFCH time domain resource includes the first PSFCH time domain resource or the second PSFCH time domain resource.
11. The method according to claim 10, characterized in that:

    The frequency domain resources and code domain resources of the first symbol are used first, and the frequency domain resources and code domain resources of the second symbol are used first. are used later, or the frequency domain resources of the first symbol and the frequency domain resources of the second symbol are used first, and the code domain resources of the first symbol and the code domain resources of the second symbol are used later. use.
12. The method according to claim 8, characterized in that the third PSFCH time domain resource in the at least one PSFCH time domain resource occupies a first symbol and a second symbol, and the first symbol is used to transmit HARQ information, the The second symbol is used to receive HARQ information, or the first symbol is used to receive HARQ information, and the second symbol is used to send HARQ information, wherein the third PSFCH time domain resource includes the third PSFCH time domain resource. A PSFCH time domain resource and/or the second PSFCH time domain resource.
13. The method according to claim 12, characterized in that:

    The time slot in which the third PSFCH time domain resource is located includes symbols used to send a third transport block, and the first symbol occupied by the third PSFCH time domain resource is used to send HARQ information. The second symbol occupied by the resource is used to receive HARQ information, wherein the first symbol precedes the second symbol; or,

    The time slot in which the third PSFCH time domain resource is located includes symbols used to receive the fourth transport block, and the first symbol occupied by the third PSFCH time domain resource is used to receive HARQ information, the third PSFCH time domain resource The second symbol occupied by the resource is used to send HARQ information.
14. The method according to any one of claims 2 to 13, characterized in that,

    The at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information, and the at least one interleaved frequency domain resource occupied by the second transport block includes the At least one interleaved frequency domain resource occupied by the second HARQ information.
15. A method of communication, characterized by including:

    The second terminal equipment receives the first indication information from the first terminal equipment, the first indication information is used to indicate at least one physical sidelink feedback channel PSFCH time domain resource within the channel occupancy time COT;

    The second terminal device receives the first transmission block from the first terminal device within the COT;

    The second terminal device sends the first hybrid automatic repeat request HARQ information corresponding to the first transmission block to the first terminal device in the first PSFCH time domain resource in the at least one PSFCH time domain resource, The first HARQ information occupies at least one resource block set, and the resource block set includes at least one resource block.
16. A method of communication, characterized by including:

    The first terminal device sends a first transmission block to the second terminal device within the channel occupancy time COT, the first transmission block occupies at least one interlace, and the interleave includes at least one resource block;

    The first terminal device receives the first hybrid automatic repeat request HARQ information corresponding to the first transmission block from the second terminal device in the COT, and the first HARQ information occupies at least one interleave The frequency domain resources are determined based on at least one interleaved frequency domain resource occupied by the first transmission block.
17. The method according to claim 16, characterized in that:

    The at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information.
18. The method according to claim 16 or 17, characterized in that,

    The frequency domain resource corresponding to the i-th interlace of the first time slot is the same as the frequency domain resource corresponding to the j-th interlace of the second time slot. The first time slot is the time slot for transmitting the first transmission block, so The second time slot is a time slot for receiving the first HARQ information, and the i-th interlace of the first time slot is associated with the j-th interlace of the second time slot, where i and j are positive integers.
19. The method according to any one of claims 16 to 18, characterized in that the method further includes:

    The first terminal device sends a second transmission block to the second terminal device within the COT, and the second transmission block occupies at least one interleave;

    The first terminal device receives the second HARQ information corresponding to the second transmission block from the second terminal device in the COT, and the at least one interleaved frequency domain resource occupied by the second HARQ information is Determined according to at least one interleaved frequency domain resource occupied by the second transport block.
20. The method according to claim 19, characterized in that:

    The at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information.
21. The method according to claim 19 or 20, characterized in that,

    The frequency domain resource corresponding to the i-th interlace of the third time slot is the same as the frequency domain resource corresponding to the j-th interlace of the second time slot. The third time slot is the time slot for transmitting the second transmission block, so The first time slot is a time slot for receiving the second HARQ information, and the i-th interlace of the third time slot is associated with the j-th interlace of the second time slot.
22. The method according to claim 21, characterized in that:

    The code domain resource of the PSFCH resource corresponding to the i-th interlace in the first time slot is different from the code domain resource of the PSFCH resource corresponding to the i-th interlace in the third time slot.
23. The method according to claim 21 or 22, characterized in that,

    The first time slot and the third time slot are associated with the second time slot, and the second time slot is when the first terminal device sends the first transmission block in the first time slot. The first time slot including PSFCH resources after the last M time slots, and the second time slot is M time slots after the first terminal device sends the second transmission block in the third time slot. The first slot after the slot that contains PSFCH resources.
24. A method of communication, characterized by including:

    The second terminal device receives the first transmission block from the first terminal device within the channel occupancy time COT, the first transmission block occupies at least one interlace, and the interleave includes at least one resource block;

    The second terminal device sends the first hybrid automatic repeat request HARQ information corresponding to the first transport block to the first terminal device in the COT, and the first HARQ information occupies at least one interleaved The frequency domain resource is determined based on at least one interleaved frequency domain resource occupied by the first transport block.
25. A communication device, characterized by including:

    A sending unit configured to send first indication information to the second terminal device, where the first indication information is used to indicate at least one physical sidelink feedback channel PSFCH time domain resource within the channel occupancy time COT;

    The sending unit is also configured to send the first transmission block to the second terminal device within the COT;

    A receiving unit configured to receive the first hybrid automatic repeat request HARQ information corresponding to the first transmission block from the second terminal device in the first PSFCH time domain resource in the at least one PSFCH time domain resource, The first HARQ information occupies at least one interlace, and the interlace includes at least one resource block.
26. The device according to claim 25, characterized in that:

    The receiving unit is also configured to receive a second transmission block from the second terminal device in the COT; the second PSFCH time domain resource of the first terminal device in the at least one PSFCH time domain resource. , sending the second HARQ information corresponding to the second transport block to the second terminal device, where the second HARQ information occupies at least one interleave;

    The sending unit is also configured to use the second PSFCH time domain resource in the at least one PSFCH time domain resource, Send second HARQ information corresponding to the second transport block to the second terminal device, where the second HARQ information occupies at least one interlace.
27. The device according to claim 26, characterized in that:

    The first indication information is used to indicate that the first PSFCH time domain resource is used to receive the first HARQ information, and the second PSFCH time domain resource is used to send the second HARQ information.
28. The device according to any one of claims 25 to 27, characterized in that:

    The at least one PSFCH time domain resource belongs to the candidate PSFCH time domain resource in the COT.
29. The device according to any one of claims 25 to 28, characterized in that:

    The first indication information is used to indicate whether the candidate PSFCH time domain resource in the COT is the at least one PSFCH time domain resource.
30. The device according to claim 29, characterized in that:

    The candidate PSFCH time domain resources in the COT are periodically configured in the time-frequency resource set.
31. The device according to claim 29 or 30, characterized in that the device further comprises a processing unit;

    The processing unit is configured to determine the candidate PSFCH time in the COT based on at least one of the starting position of the COT, the length of the COT, and the configuration period of the candidate PSFCH time domain resource in the COT. domain resources.
32. The device according to any one of claims 25 to 31, characterized in that:

    The number of symbols occupied by one PSFCH time domain resource in the at least one PSFCH time domain resource is equal to or greater than 1.
33. The device according to claim 32, characterized in that:

    The first sidelink control information SCI schedules the first transport block, the first SCI indicates that the first transport block is multicast, and the number of symbols occupied by the first PSFCH time domain resource is greater than 1.
34. The device according to claim 32, characterized in that:

    The third PSFCH time domain resource in the at least one PSFCH time domain resource occupies a first symbol and a second symbol, and the first symbol and the second symbol are used to transmit HARQ information, or the first symbol and The second symbol is used to receive HARQ information, wherein the third PSFCH time domain resource includes the first PSFCH time domain resource or the second PSFCH time domain resource.
35. The device according to claim 34, characterized in that:

    The frequency domain resources and code domain resources of the first symbol are used first, and the frequency domain resources and code domain resources of the second symbol are used later, or the frequency domain resources of the first symbol and the second symbol are used. The frequency domain resources of the symbol are used first, and the code domain resources of the first symbol and the code domain resources of the second symbol are used later.
36. The device according to claim 32, characterized in that the third PSFCH time domain resource in the at least one PSFCH time domain resource occupies a first symbol and a second symbol, and the first symbol is used to transmit HARQ information, the The second symbol is used to receive HARQ information, or the first symbol is used to receive HARQ information, and the second symbol is used to send HARQ information, wherein the third PSFCH time domain resource includes the third PSFCH time domain resource. A PSFCH time domain resource and/or the second PSFCH time domain resource.
37. The device according to claim 36, characterized in that:

    The time slot in which the third PSFCH time domain resource is located includes symbols used to send a third transport block, and the first symbol occupied by the third PSFCH time domain resource is used to send HARQ information. The second symbol occupied by the resource is used to receive HARQ information, wherein the first symbol precedes the second symbol; or,

    The time slot in which the third PSFCH time domain resource is located includes symbols used to receive the fourth transport block, and the first symbol occupied by the third PSFCH time domain resource is used to receive HARQ information, the third PSFCH time domain resource The second symbol occupied by the resource is used to send HARQ information.
38. The device according to any one of claims 26 to 37, characterized in that:

    The at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information, and the at least one interleaved frequency domain resource occupied by the second transport block includes the At least one interleaved frequency domain resource occupied by the second HARQ information.
39. A communication device, characterized by including:

    A receiving unit configured to receive first indication information from the first terminal device, the first indication information being used to indicate at least one physical sidelink feedback channel PSFCH time domain resource within the channel occupancy time COT;

    The receiving unit is also configured to receive the first transmission block from the first terminal device in the COT;

    A sending unit configured to send the first hybrid automatic repeat request HARQ information corresponding to the first transmission block to the first terminal device in the first PSFCH time domain resource in the at least one PSFCH time domain resource, so The first HARQ information occupies at least one resource block set, and the resource block set includes at least one resource block.
40. A communication device, characterized by including:

    A sending unit, configured to send a first transmission block to the second terminal device within the channel occupancy time COT, where the first transmission block occupies at least one interleave, and the interleave includes at least one resource block;

    A receiving unit configured to receive, within the COT, first hybrid automatic repeat request HARQ information corresponding to the first transmission block from the second terminal device, where the first HARQ information occupies at least one interleaved The frequency domain resource is determined based on at least one interleaved frequency domain resource occupied by the first transport block.
41. The device according to claim 40, characterized in that:

    The at least one interleaved frequency domain resource occupied by the first transport block includes at least one interleaved frequency domain resource occupied by the first HARQ information.
42. The device according to claim 40 or 41, characterized in that,

    The frequency domain resource corresponding to the i-th interlace of the first time slot is the same as the frequency domain resource corresponding to the j-th interlace of the second time slot. The first time slot is the time slot for transmitting the first transmission block, so The second time slot is a time slot for receiving the first HARQ information, and the i-th interlace of the first time slot is associated with the j-th interlace of the second time slot, where i and j are positive integers.
43. The device according to any one of claims 40 to 42, characterized in that:

    The sending unit is also configured to send a second transmission block to the second terminal device within the COT, where the second transmission block occupies at least one interleave;

    The receiving unit is further configured to, within the COT, receive second HARQ information corresponding to the second transmission block from the second terminal device, where the second HARQ information occupies at least one interleaved frequency domain. The resource is determined based on at least one interleaved frequency domain resource occupied by the second transport block.
44. The device according to claim 43, characterized in that:

    The at least one interleaved frequency domain resource occupied by the second transport block includes at least one interleaved frequency domain resource occupied by the second HARQ information.
45. The device according to claim 43 or 44, characterized in that:

    The frequency domain resource corresponding to the i-th interlace of the third time slot is the same as the frequency domain resource corresponding to the j-th interlace of the second time slot. The third time slot is the time slot for transmitting the second transmission block, so The first time slot is to receive the second HARQ information time slot, the i-th interlace of the third time slot is associated with the j-th interlace of the second time slot.
46. The device according to claim 45, characterized in that:

    The code domain resource of the PSFCH resource corresponding to the i-th interlace in the first time slot is different from the code domain resource of the PSFCH resource corresponding to the i-th interlace in the third time slot.
47. The device according to claim 45 or 46, characterized in that,

    The first time slot and the third time slot are associated with the second time slot, and the second time slot is when the first terminal device sends the first transmission block in the first time slot. The first time slot including PSFCH resources after the last M time slots, and the second time slot is M time slots after the first terminal device sends the second transmission block in the third time slot. The first slot after the slot that contains PSFCH resources.
48. A communication device, characterized by including:

    A receiving unit configured to receive a first transmission block from the first terminal device within the channel occupancy time COT, where the first transmission block occupies at least one interleave, and the interleave includes at least one resource block;

    A sending unit configured to send the first hybrid automatic repeat request HARQ information corresponding to the first transport block to the first terminal device in the COT, and the first HARQ information occupies at least one interleaved frequency. The domain resource is determined based on at least one interleaved frequency domain resource occupied by the first transport block.
49. A communication device, characterized by including:

    Processor and transceiver, the transceiver is used to receive computer code or instructions and transmit them to the processor, the processor executes the computer code or instructions, the method according to any one of claims 1 to 24 .
50. A computer-readable storage medium, characterized by including:

    The computer readable medium stores a computer program;

    The computer program, when run on a computer or a processor, causes the computer or the processor to execute the method of any one of claims 1 to 24.
51. A computer program product, characterized in that it includes a computer program. When the computer program is executed, the method according to any one of claims 1 to 24 is implemented.